计算(1)12+(-8)+11+(-2)+(-12);(2)118÷(23+16-12);(3)(-1)3×(-5)÷[-32+(-2)2].-数学

题目简介

计算(1)12+(-8)+11+(-2)+(-12);(2)118÷(23+16-12);(3)(-1)3×(-5)÷[-32+(-2)2].-数学

题目详情

计算
(1)12+(-8)+11+(-2)+(-12);
(2)
1
18
÷(
2
3
+
1
6
-
1
2
);
(3)(-1)3×(-5)÷[-32+(-2)2].
题型:解答题难度:中档来源:不详

答案

(1)原式=12-8+11-2-12
=4+11-2-12
=15-2-12
=13-12
=1;

(2)原式=class="stub"1
18
÷class="stub"1
3

=class="stub"1
18
×3
=class="stub"1
6


(3)原式=(-1)3×(-5)÷[-9+4]
=(-1)×(-5)×(-class="stub"1
5

=5×(-class="stub"1
5

=-1.

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