题目内容
85
×
+75
×
+56
×
.
| 1 |
| 3 |
| 3 |
| 8 |
| 5 |
| 6 |
| 6 |
| 7 |
| 1 |
| 4 |
| 4 |
| 5 |
分析:首先把带分数化成假分数,然后根据分数的基本性质约分,即可得解.
解答:解:85
×
+75
×
+56
×
=
×
+
×
+
×
=32+65+45
=142.
| 1 |
| 3 |
| 3 |
| 8 |
| 5 |
| 6 |
| 6 |
| 7 |
| 1 |
| 4 |
| 4 |
| 5 |
=
| 256 |
| 3 |
| 3 |
| 8 |
| 456 |
| 6 |
| 6 |
| 7 |
| 225 |
| 4 |
| 4 |
| 5 |
=32+65+45
=142.
点评:关键是利用分数的基本性质约分,去掉分母,然后求和.
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