MT, ĐỀ, ĐÁP ÁN ĐẠI 8 CHƯƠNG 1

MA TRẬN ĐỀ KIỂM TRA ĐẠI 8 CHƯƠNG 1
Cấp độ

Chủ đề
Nhận biết
Thông hiểu
Vận dụng

Cộng




Thấp
Cao



1. Nhân đơn thức với đa thức
 Biết nhân đơn thức với đa thức, đa thức nhân đa thức





Số câu
Số điểm
Tỉ lệ
2
2
20%



2
2
20%

2. Các hằng đẳng thức đáng nhớ



Vận dung HĐT để tìm GTLN


Số câu
Số điểm
Tỉ lệ



1
0,5
5%
1
0,5
5%


3. Phân tích đa thức thành nhân tử

Phân tích được các đa thức thành nhân tử
Vận dụng phân tích đa thức thành nhân tử để tìm x
Phân tích tam thức bậc hai thành nhân tử


Số câu
Số điểm
Tỉ lệ

2
2
20 %
2
2
20%
1
0,5
5%
5
4,5
45 %



4. Chia đa thức
Biết chia đơn thức cho đơn thức

Thực hiện phép chia đa thức 1 biến đã sắp xếp, tìm ĐK để phép chia hết



Số câu
Số điểm
Tỉ lệ
1
1
10%

1
2
20%

2
3
30%

Tổng số câu
Tổng số điểm
Tỉ lệ %
3
3
30%
2
2
20%
3
4
30%
2
1
10%
10
10
100%







TRƯỜNG THCS TT
Họ và tên:................................................................................
Lớp: 8A Năm học 2017 - 2018
 KIỂM TRA 45 PHÚT - Bài số 1
MÔN: ĐẠI SỐ








ĐỀ BÀI + BÀI LÀM
Bài 1. Thực hiện phép tính:
a) x.(5x- 6) b) (x+3).(2x + 5) c) 20a2b2c3 : 5ab2c
.........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Bài 2 . Phân tích các đa thức sau thành nhân tử:
a) x2 + 5x + 5xy + 25y b) x2 + 14x + 49 – y2
..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Bài 3. Cho hai đa thức : A(x) = x3 – 4x2 + 3x + a và B(x) = x +3
Với giá trị nào của a thì A(x) chia hết cho B(x)?
............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Bài 4. Tìm x, biết
a) 2x2 + 8x = 0 b) x2.(2x + 7) – 16. (2x+7) = 0
..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Bài 5.
a) phân tích đa thức x2 – 7x – 60 thành nhân tử ?
................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
b) Tìm giá trị lớn nhất của A = - x2 + 8x + 2001
.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Câu
ý
Nội dung
Điểm
Cộng


1
a
x.(5x - 6) = 5x2 – 6x
1


3


b
(x+3).(2x + 5) = 2x2 + 5x +6x +15
= 2x2 + 11x +15
0,5
0,5



c
20a2b2c3 : 5ab2c = 4ac
1





2
a
x2 + 5x + 5xy + 25y
= (x2 + 5x)+ (5xy + 25y )
= x(x+5) +5y(x+5)
= (x+5)(x+5y)

0,25
0,5
0,25




2



b
x2 + 14x + 49 – y2
= (x2 + 14x + 49) – y2
= (x + 7)2 – y2
= (x + 7 – y)(x+7 +y)

0,25
0,5
0,25






3

 x3 – 4x2 +3x + a x+3
x3 + 3x2 x2 - 7x +24
- 7x2 + 3x + a
- 7x2 - 21x
24x + a
24x + 72
a – 72
Để A(x) Chia hết cho B(x) thì dư của phép chia bằng 0
( a – 72 = 0
( a = 72


0,5


0,5

0,5

0.25
0,25






2






4
a
2x2 + 8x = 0
<=> 2x(x + 4) = 0