题目内容
3.85×2
+0.15÷
.
| 1 |
| 4 |
| 4 |
| 9 |
分析:把小数化为分数,运用乘法分配律简算.
解答:解:3.85×2
+0.15÷
=
×
+
×
=(
+
)×
=4×
=9.
| 1 |
| 4 |
| 4 |
| 9 |
=
| 77 |
| 20 |
| 9 |
| 4 |
| 3 |
| 20 |
| 9 |
| 4 |
=(
| 77 |
| 20 |
| 3 |
| 20 |
| 9 |
| 4 |
=4×
| 9 |
| 4 |
=9.
点评:注意数字转化,运用合适的简便方法计算.
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