问题 解答题
计算(能简算的要简算).
57.5-4.25-15.75; 
5
7
×16-2÷
7
5
; 35÷
7
8
×1-
2
7
答案

(1)57.5-4.25-15.75

=57.5-(4.25+15.75)

=57.5-20

=37.5;

(2)

5
7
×16-2÷
7
5

=

5
7
×16-2×
5
7

=

5
7
×(16-2)

=

5
7
×14

=10;

(3)35÷

7
8
×1-
2
7

=35×

8
7
×1-
2
7

=40-

2
7

=39

5
7

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