Kiem tr toan 6

Trường THCS Đặng Chánh kỷ Thứ 2 ngày 17 tháng 01 năm 2011
Họ và tên:................................. Kiểm tra 1 tiết chương 2
Lớp 6C (Đề 1) Môn : Số học
Đề bài:
Bài1: (5đ) Tìm x
Z biết:
a/ 2x – (- 27) = 15 b/ -13
= - 39
c/
< 5 d/ 2(x-1) – 3(x+2) = 2(2x+1)
e/
= 49 f/ x+18 = 2x + 35
g/ (x+1) +(x+2) + (x+3)+ ......+(x+100) = 20550 h/ 2x +5
x +1

Bài2: (4 đ) Tính tổng đại số sau: (Tính nhanh nếu có thể)
a/ 233 – 476 – 124 + 767 b/ 126-(-4) +7 -20
c/ 101 -102-(-103)-104-(-105)-106-........- 2010 d/ (- 158).56 + 43.(-158) +(-158)

Bài3: (1 đ) Biết a-b
6 . Chứng tỏ rằng a + 17b
6
Bài làm:
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Trường THCS Đặng Chánh kỷ Thứ 2 ngày 17 tháng 01 năm 2011
Họ và tên:................................. Kiểm tra 1 tiết chương 2
Lớp 6C (Đề2) Môn : Số học
Đề bài:
Bài1: (5đ) Tìm x
Z biết:
a/ 2x – (-37) = 15 b/ -13
= - 26
c/
< 6 d/ 2(x-1) – 3(x+2) = 2(2x+1)
e/
= 81 f/ x+28 = 2x + 55
g/ (x+1) +(x+2) + (x+3)+ ......+(x+100) = 20550 h/ 2x - 5
x - 1

Bài2: (4 đ) Tính tổng đại số sau: (Tính nhanh nếu có thể)
a/ 253 – 576 – 324 + 747 b/ 326-(-4) +7 - 120
c/ -101 –(-102) – 103 –( -104) -105 –(-106)-.....-(- 2010) d / (- 258).56 + 43.(-258) +(-258)

Bài3: (1 đ) Biết a+b
6 . Chứng tỏ rằng a + 19b
6
Bài làm:
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