列式计算．①57的9倍是多少？②67与53的和，除以36与30的差，商是多少？
把假分数化成带分数或整数． ①②．
把下面的假分数化成带分数或整数．====
把带分数化成假分数． 2= 3= 1= 4=
数的改写． （1）把下面的分数化成小数，小数化成分数．== 0.28= 0.035= （2）把下列分数中的假分数化成带分数，带分数化成假分数．====
把假分数化成带分数或把带分数化成假分数．====
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= 3
= 1
= 4
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