问题 解答题
计算:
(1)(-20)+(+3)-(-5)-(-7);
(2)(-
3
4
-
7
9
+
5
12
)×(-36)

(3)-22×(-5)-6÷(-2)2×|-
1
4
|
答案

(1)原式=-20+3+5+7

=-5;

(2)原式=(-

3
4
)×(-36)-
7
9
×(-36)+
5
12
×(-36)

=27+28-15

=40;

(3)原式=-4×(-5)-6÷4×

1
4

=20-

3
2
×
1
4

=20-

3
8

=19

5
8

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