问题
解答题
计算下列各题: (1)3×(-2)-(-1)÷
(2)-7×(-
(3)-13-(1-0.5)×
(4)(-2)2-(3-5)-
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答案
(1)原式=-6+1×3×(-3)
=-6-9
=-15;
(2)原式=-
×(-7+26-2)22 7
=-
×(-21)22 7
=-66;
(3)原式=-1-
×1 2
×(2-9)1 3
=-1+7 6
=
;1 6
(4)原式=4-(-2)-2-6
=-2.