问题 解答题
计算:
(1)3
1
2
+(-
1
2
)-(-
1
3
)+2
2
3
;          
(2)-1
2
7
÷(-1
5
6
)×1
3
8
×(-7)

(3)-22×(-
1
2
)+8÷(-2)2

(4)-3-[-5+(1-2×
3
5
)÷(-2)]

(5)-2-12×(
1
3
-
1
4
+
1
2
)
答案

(1)原式=3

1
2
-
1
2
+
1
3
+2
2
3

=3+3

=6;

(2)原式=-(

9
7
×
6
11
×
11
8
×7)

=-

27
4

(3)原式=4×

1
2
+8÷4

=2+2

=4;

(4)原式=-3+5-(1-2×

3
5
)÷(-2)

=2-(-

1
5
)×(-
1
2

=2-

1
10

=

19
10

(5)原式=-2-(

1
3
×12-
1
4
×12+
1
2
×12)

=-2-(4-3+6)

=-2-7

=-9.

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