问题 解答题
计算:
(1)14+(-11)+7                  
(2)-2×9-8×(-2)
(3)-23×(-
2
2-72            
(4)30÷(
1
5
-
1
6
答案

(1)14+(-11)+7                  

=14-11+7              

=10;

(2)-2×9-8×(-2)

=-18+16

=-2;             

(3)-23×(-

1
4
2-72                       

=-8×

1
16
-49

=-49

1
2

(4)30÷(

1
5
-
1
6

=30÷(

6
30
-
5
30

=30÷

1
30

=30×30

=900.

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