15问答网 > 把一个小数的小数点向右移动一位后 所得的数比原数多了9.9原数是多少？

把一个小数的小数点向右移动一位后 所得的数比原数多了9.9原数是多少？

2025-02-09 03:11:05
推荐回答（1个）
回答1：

你画个图就明白了
原数

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扩大后
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也就是
扩大后的后面9个=9.9
而这10个都是相等的，原数有1个，而扩大后有10个，又知道了九个是多少
列式：

9.9÷（10-1）
=9.9÷9

【也就是那九个小格一个有多少】
=1.1
希望采纳哦~

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