题目内容

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