题目内容

2.5×3.2×1.25
72×87.5+87.5×28
215×
3
7
×0.4×
7
8

3.7×4.6+6.4×3.7-3.7.
(1)2.5×3.2×1.25,
=2.5×0.4×8×1.25,
=1×10,
=10;

(2)72×87.5+87.5×28,
=87.5×(72+28),
=87.5×100,
=8750;

(3)215×
3
7
×0.4×
7
8

=(215×0.4)×(
3
7
×
7
8
),
=86×
3
8

=
129
4

=32
1
4


(3)3.7×4.6+6.4×3.7-3.7,
=3.7×(4.6+6.4-1),
=3.7×10,
=37.
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