题目内容
简便计算:(
+
)÷
.
| 17 |
| 99 |
| 1717 |
| 9999 |
| 171717 |
| 979797 |
考点:分数的巧算
专题:计算问题(巧算速算)
分析:把
化成
,把
化成
,计算即可.
| 1717 |
| 9999 |
| 17×101 |
| 99×101 |
| 171717 |
| 979797 |
| 17×10101 |
| 97×10101 |
解答:
解:(
+
)÷
=(
+
)÷
=
×2÷
=
×2×
=
| 17 |
| 99 |
| 1717 |
| 9999 |
| 171717 |
| 979797 |
=(
| 17 |
| 99 |
| 17×101 |
| 99×101 |
| 17×10101 |
| 97×10101 |
=
| 17 |
| 99 |
| 17 |
| 97 |
=
| 17 |
| 99 |
| 97 |
| 17 |
=
| 194 |
| 99 |
点评:此题解答的关键在于运用转化的数学思想,把数字进行拆分,从而达到巧妙的目的.
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