题目内容

脱式计算,能简便的要简算.
57.5-3.25-16.75  
125×3.2×25  
5
7
×16.31-2.31÷
7
5
6760÷13+17×25  4.82-5.2÷0.8×0.635÷
7
8
×1-
2
7
(1)57.5-3.25-16.75,
=57.5-(3.25+16.75),
=57.5-20,
=37.5;

(2)125×3.2×25,
=125×8×0.4×25,
=(125×8)×(0.4×25),
=1000×10,
=10000;

(3)
5
7
×16.31-2.31÷
7
5

=
5
7
×16.31-2.31×
5
7

=
5
7
×(16.31-2.31),
=
5
7
×14,
=10;

(4)6760÷13+17×25,
=520+425,
=945;

(5)4.82-5.2÷0.8×0.6,
=4.82-6.5×0.6,
=4.82-3.9,
=0.92;

(6)35÷
7
8
×1-
2
7

=35×
8
7
×1-
2
7

=40-
2
7

=39
5
7
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