题目内容
2
×
+1
×0.25+
÷4.
| 1 |
| 7 |
| 1 |
| 4 |
| 4 |
| 7 |
| 2 |
| 7 |
分析:根据题意,0.25=
,
÷4=
×
,然后再根据乘法分配律进行简算.
| 1 |
| 4 |
| 2 |
| 7 |
| 2 |
| 7 |
| 1 |
| 4 |
解答:解:
2
×
+1
×
+
÷4
=2
×
+1
×
+
×
=(2
+1
+
)×
=4×
=1.
2
| 1 |
| 7 |
| 1 |
| 4 |
| 4 |
| 7 |
| 1 |
| 4 |
| 2 |
| 7 |
=2
| 1 |
| 7 |
| 1 |
| 4 |
| 4 |
| 7 |
| 1 |
| 4 |
| 2 |
| 7 |
| 1 |
| 4 |
=(2
| 1 |
| 7 |
| 4 |
| 7 |
| 2 |
| 7 |
| 1 |
| 4 |
=4×
| 1 |
| 4 |
=1.
点评:根据除以一个数等于乘这个数的倒数,把除法化为乘法,然后再根据乘法分配律进一步计算.
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