七年级上数学第二章有理数及其运算-有理数的混合运算技巧专练(含答案)
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(1) 2+(-2) = (2) 1-3 = (3) (-1)×(-3) =
(4) 12÷(-3) = (5) × = (6) 3-∣-2∣=
果
( 3) -+(-2)÷(-)-∣-5∣
答案
课堂思维碰撞
1-5 . BBBBB 6 . D 7 . D
8 . 12.6℃ 9 . -3 10 . 360 11 . 5.16 12 .
13 . 31 14 . 7
15 . (1) 1135 (2) 43的“叠加数”为5543,2243 不是 43 的“叠加数”
16 . (1) -8 (2) -1
17 . (1) 3 (2) 47 (3) -10 (4) 1
18 . (1) 1 (2) -10
19 . (1) 佳佳,昊昊 (2) 2
课后创新培养
1-5 . AABBC 6 . B 7 . 248 8 . -7 9 . 6或46
10 . 2 15 11 . -
12 . (1) 240 (2) - (3) -359 (4) 5 (5) 119 (6) -1
13 . (1) 1 (2) ABD (3) ( (4) -1
14 . (1) 1 (2) A<B
15 . (1) -13 (2) 7 16 . (1) (2)
17 . (1) 0 1 2 (2) = ×(5-1) (3)
18 . (1) (-2,1)不是“共生有理数对”.(3,)是“共生有理数对”
(2) -64 (3) (-2n, - 2m)不是“共生有理数对”