题目内容
怎样简便就怎样算
|
|
(1)
×72-
×23,
=(72-23)×
,
=49×
,
=35;
(2)
×25×40×
,
=(
×40)×(25×
),
=22×9,
=198.
| 5 |
| 7 |
| 5 |
| 7 |
=(72-23)×
| 5 |
| 7 |
=49×
| 5 |
| 7 |
=35;
(2)
| 11 |
| 20 |
| 9 |
| 25 |
=(
| 11 |
| 20 |
| 9 |
| 25 |
=22×9,
=198.
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题目内容
怎样简便就怎样算
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