题目内容

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].
(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
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