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# 复习小数数位

## 数位顺序表

$8$$7$$.$$6$$5$$4$

## 小数数位

$0.81$$8$ 个0.1和 $1$ 个0.01组成.

$0.81=0.8+0.01$
$0.81=\frac{8}{10}+\frac{1}{100}$

$0$$.$$8$$1$
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