下面各题，怎样简便就怎样算．4×4.9×25 ×+÷ 7.6×99 ÷[×（+）] 720÷15÷6 +÷++0.6+ （6+）÷3．
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．====
×
+
÷
7.6×99 
÷[
×（
+
）] 720÷15÷6 
+
+
+0.6+
（6+
）÷3．
②
．
=
=
=
=
= 3
= 1
= 4
=
=
=
=
=
=
=
=
=
=
=
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