题目内容

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)].
(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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