题目内容
8.4-1
×2
÷2
÷
+0.17.
| 2 |
| 3 |
| 2 |
| 5 |
| 2 |
| 3 |
| 3 |
| 4 |
分析:先把带分数化成假分数,再利用除以一个数等于乘这个数的倒数,然后约分,最后按四则混合运算的顺序计算出结果.
解答:解:8.4-1
×2
÷2
÷
+0.17,
=8.4-
×
÷
÷
+0.17,
=8.4-
×
×
×
+0.17,
=8.4-2+0.17,
=6.57.
| 2 |
| 3 |
| 2 |
| 5 |
| 2 |
| 3 |
| 3 |
| 4 |
=8.4-
| 5 |
| 3 |
| 12 |
| 5 |
| 8 |
| 3 |
| 3 |
| 4 |
=8.4-
| 5 |
| 3 |
| 12 |
| 5 |
| 3 |
| 8 |
| 4 |
| 3 |
=8.4-2+0.17,
=6.57.
点评:此题考查了分数的约分和按四则混合运算的顺序计算.
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