题目内容
| 简便方法计算. (
|
| 5.2×
|
(1)(
+
)×7
=
×7+
×7
=3+
=3
;
(2)
×63%+
×63%
=(
+
)×63%
=2×0.63
=1.26;
(3)5.2×
+1.8×0.25
=(5.2+1.8)×0.25
=7×0.25
=1.75.
| 3 |
| 7 |
| 3 |
| 28 |
=
| 3 |
| 7 |
| 3 |
| 28 |
=3+
| 3 |
| 4 |
=3
| 3 |
| 4 |
(2)
| 3 |
| 5 |
| 7 |
| 5 |
=(
| 3 |
| 5 |
| 7 |
| 5 |
=2×0.63
=1.26;
(3)5.2×
| 1 |
| 4 |
=(5.2+1.8)×0.25
=7×0.25
=1.75.
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