问题 解答题
计算:
(1)-5+6-7+8                            
(2)-42×
5
8
-(-5)×0.25×(-4)3
(3)(-3)×(-4)÷(-6)
(4)-
1
3
×(-3)2

(5)-1.53×0.75-0.53×(-
3
4

(6)-
3
4
-(1-0.5)÷
1
3
×[2+(-4)2].
答案

(1)原式=[(-5)+(-7)]+(6+8)=-12+14=2;

(2)原式=-16×

5
8
-(-5)×
1
4
×(-64)=-10-(-80)=-10+80=70;

(3)原式=12÷(-6)=-2;

(4)原式=-

1
3
×9=-3;

(5)原式=-1.53×0.75+0.53×0.75=0.75×(-1.53+0.53)=0.75;

(6)原式=-

3
4
-0.5×3×18=-
3
4
-27=-27
3
4

单项选择题 A型题
单项选择题 B型题