De kiem tra 45

Trường THCS định tăng bài kiểm tra 45 phút
Năm học: 2010 – 2011 Môn: Số học 6

Họ và tên :............................................................ Lớp :...........






Phần I. Trắc nghiệm(3đ): Mỗi câu sau chỉ có một đáp án đúng, em hãy khoanh tròn chữ cái đứng trước đáp án em cho là đúng.
Câu 1: Sắp xếp các số nguyên sau: - 25 ; 35; 0; -250 ; 84 theo thứ tự tăng dần ta được kết quả nào sau đây:
A, 0; -25; 35; 84; -250 B, -250; -25; 0; 35; 84 C, 0; 84; -25; -250 D, 84;35; 0; -250; -25
Câu 2: Điền dấu > ; < ; = thích hợp vào chỗ chấm:
A, 248 ….. – 348 B, (- 25) . 36 …… ( - 36) . (- 25)
C, 45 . 0 ….. – 45 D, (- 5)7 . (- 2) . (- 10) ….. (-5)6. (-2).(-10)
Câu 3: Tổng của hai số nguyên a và b tính theo quy tắc sau: a + b = - ( a + b ). Hãy cho biết khẳng định nào sau là đúng:
A, a > 0, b > 0 B, a > 0, b < 0 C, a < 0, b < 0 D, a < 0, b > 0
Phần II. Tự luận (7đ):
Câu 4(3đ): Thực hiện phép tính:
a, (- 37) + (- 63) + (- 96)
b, (- 500) – 300 – (- 635)
c, (- 4)2 . 5 + (- 6) . ( - 84 + 57 )
Câu 5(2đ) Tìm số nguyên x biết :
a, 15 . x – 24 = - 99
b, (- 2) . [3 . x2 – 245 : (- 7)2 ] = - 140

Câu 6(1đ): Tính nhanh: ( 23 . 94 + 93 . 45) : ( 92 . 10 – 92)

Câu 7(1đ): Tìm các cặp số tự nhiên (x,y) thoả mãn : ( x – 2 ) . ( 2 .y + 3) = 26
Bài làm

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