题目内容

计算
(1)12+(-8)+11+(-2)+(-12);
(2)
1
18
÷(
2
3
+
1
6
-
1
2
);
(3)(-1)3×(-5)÷[-32+(-2)2].
(1)原式=12-8+11-2-12
=4+11-2-12
=15-2-12
=13-12
=1;

(2)原式=
1
18
÷
1
3

=
1
18
×3
=
1
6


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

=5×(-
1
5

=-1.
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