问题 解答题
计算:
(1)-
1
4
-(-
5
6
)+
2
3
+(-
1
2
)

(2)(-125
5
7
)÷(-5)

(3)[1-(1-0.5×
1
3
)]×[2-(-3)2]

(4)-62-(3-7)2-2×(-1)3-|-2|.
答案

(1)原式=-

1
4
+
5
6
+
2
3
-
1
2

=-

1
4
-
1
2
+
5
6
+
2
3

=-

3
4
+
3
2

=

3
4

(2)原式=(-125-

5
7
)÷(-5)

=125÷5+

5
7
÷5

=25+

1
7

=25

1
7

(3)原式=[1-(1-

1
6
)]×(2-9)

=

1
6
×(-7)

=-

7
6

(4)原式=-36-(-4)2-2×(-1)-2

=-36-16+2-2

=-52.

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