问题 解答题
计算:
(1)(-2
1
3
)-
5
6
+(-0.5)-(-1
1
6
);          
(2)-1-(1+0.5)×
1
3
÷(-4);
(3)(-1)3×(-5)÷[(-3)2+2×(-5)].
答案

(1)原式=(-2

1
3
-
1
2
)+(-
5
6
+1
1
6

=-2

5
6
+
1
3

=-2

1
2

(2)原式=-1-

3
2
×
1
3
×(-
1
4

=-1+

1
8

=-

7
8

(3)原式=-1×(-5)÷(9-10)

=-1×(-5)÷(-1)

=-5.

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