问题 解答题
计算:
(1)-20+(-14)-(-18)-13;                  
(2)(-1.5)×
4
5
÷(-
2
4
3
4

(3)
7
8
÷
7
8
-
2
3
×(-6)
;                 
(4)(-
3
4
-
5
9
+
7
12
1
36

(5)-22+8÷(-2)3+(-4)×(-3)-(-1)2012
答案

(1)原式=-20-14+18-13

=-47+18

=-29;

(2)原式=-

3
2
×
4
5
×(-
5
2
)×
3
4

=

9
4

(3)原式=1+4

=5;

(4)原式=(-

3
4
-
5
9
+
7
12
)×36

=-

3
4
×36-
5
9
×36+
7
12
×36

=-27-20+21

=-26;

(5)原式=-4+8×(-

1
8
)+12-(-1)

=-4-1+12+1

=8.

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