问题 解答题
计算:
(1)(
1
4
+
1
6
-
1
2
)×(-12)
(2)(-1)3×(-5)÷[(-3)2+2×(-5)].
答案

(1)原式=-

1
4
×12-
1
6
×12+
1
2
×12,

=-3-2+6         

=1;

                

(2)原式=(-1)×(-5)÷[9-10]

=5÷[-1]

=-5.

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