问题
解答题
计算: (1)-5+6-7+8 (2)-42×
(3)(-3)×(-4)÷(-6) (4)-
(5)-1.53×0.75-0.53×(-
(6)-
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答案
(1)原式=[(-5)+(-7)]+(6+8)=-12+14=2;
(2)原式=-16×
-(-5)×5 8
×(-64)=-10-(-80)=-10+80=70;1 4
(3)原式=12÷(-6)=-2;
(4)原式=-
×9=-3;1 3
(5)原式=-1.53×0.75+0.53×0.75=0.75×(-1.53+0.53)=0.75;
(6)原式=-
-0.5×3×18=-3 4
-27=-273 4
.3 4