题目内容
递等式计算(能简算的要简算).
|
75×0.5+15÷2 |
|
(
|
分析:①③根据四则混合运算的运算顺序计算即可;
②④据乘法分配律进行计算.
②④据乘法分配律进行计算.
解答:解:①
÷(1-
),
=
×
,
=
;
②75×0.5+15÷2,
=7.5×5+7.5,
=7.5×(5+1),
=7.5×6,
=45;
③
-8×
,
=
-
,
=
;
④(
-
)×45,
=
×45-
×45,
=15-9,
=6;
| 1 |
| 4 |
| 1 |
| 3 |
=
| 1 |
| 4 |
| 3 |
| 2 |
=
| 3 |
| 8 |
②75×0.5+15÷2,
=7.5×5+7.5,
=7.5×(5+1),
=7.5×6,
=45;
③
| 4 |
| 5 |
| 3 |
| 32 |
=
| 16 |
| 20 |
| 15 |
| 20 |
=
| 1 |
| 20 |
④(
| 1 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 3 |
| 1 |
| 5 |
=15-9,
=6;
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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