课堂探究例2变式训练2-2答案
(1)(-2)×9×(-1/2)×(-2/3)
=-2×9×1/2×2/3
=-6
(2)(-20)×(-30)×0×100×(-50)=0;
(3)(-0.15)×()×(-100)×()
=3/20×13/4×100×8/5
=78
课堂训练第1~2题答案
B;D
课堂训练第3题答案
-50/3
课堂训练第4题答案
(1)-0.73;-50;-73
(2)-24;-5/6;38
课堂训练第5题答案
(1)-24×(-5/6+3/8-1/12)
=-24×(-5/6)+(-24)×3/8+(-24)×(-1/12)
=20-9+2
=13
(2)
(3)-7/12×3.5×(-8/7)×(-3/2)
=-7/12×7/2×8/7×3/2
=-7/2
课后提升选择题答案
1 | 2 | 3 | 4 | 5 |
C | A | A | C | A |