题目内容
用简使方法计算下面各题.
| 1.25×4.3×0.8 |
|
(1)
×
+
×
,
=
×(
+
),
=
×
,
=
;
(2)1.25×4.3×0.8,
=1.25×0.8×4.3,
=1×4.3,
=4.3;
(3)
×15-
×3,
=
×(15-3),
=
×12,
=9.
| 5 |
| 8 |
| 2 |
| 3 |
| 9 |
| 16 |
| 2 |
| 3 |
=
| 2 |
| 3 |
| 5 |
| 8 |
| 9 |
| 16 |
=
| 2 |
| 3 |
| 19 |
| 16 |
=
| 19 |
| 24 |
(2)1.25×4.3×0.8,
=1.25×0.8×4.3,
=1×4.3,
=4.3;
(3)
| 3 |
| 4 |
| 3 |
| 4 |
=
| 3 |
| 4 |
=
| 3 |
| 4 |
=9.
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