题目内容
2.5×3.2×1.25
72×87.5+87.5×28
215×
×0.4×
3.7×4.6+6.4×3.7-3.7.
72×87.5+87.5×28
215×
| 3 |
| 7 |
| 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×
×0.4×
,
=(215×0.4)×(
×
),
=86×
,
=
,
=32
;
(3)3.7×4.6+6.4×3.7-3.7,
=3.7×(4.6+6.4-1),
=3.7×10,
=37.
=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 |
| 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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