题目内容
| ||||
| 2004-200.4×4 |
| 1 |
| 225 |
| 1 |
| 225 |
分析:此题数字较大,应选择灵活的办法解决.先看分母,可以把200.4×4根据积不变的规律写成2004×0.4,然后运用乘法分配律的逆运算计算,同样,把分子改写成0.06×(
×64+
),然后通过约分与计算,得出结果.
| 1 |
| 3 |
| 1016 |
| 15 |
解答:解:
,
=
=
,
=
,
=
=
,
=
×
,
=
.
故答案为:
.
| ||||
| 2004-200.4×4 |
=
| ||||
| 2004-2004×0.4 |
=
| ||||
| 2004×(1-0.4) |
=
0.06×(
| ||||
| 20040×0.06 |
=
| ||||
| 20040 |
=
| ||
| 20040 |
=
| 1336 |
| 15 |
| 1 |
| 20040 |
=
| 1 |
| 225 |
故答案为:
| 1 |
| 225 |
点评:此题计算比较繁琐,应仔细认真,切忌浮躁,运用运算定律或技巧进行简算.
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