把下列分数化成最简分数． ．
口算．4.2÷= ×3= ÷5= （+）×72=×12= ×1.8= ÷=
= = = == = = =
直接写出得出．20×= ÷= ×= +=÷6= ×12= += 6÷=﹣= ×= ×= 0÷=
直接写出得数．6×= ÷7= ÷= 4×1= ×= ÷=÷5= 5×= ﹣= +0.5= 1÷1= 1÷1=
列式计算．（1）的是多少？（2）一批货物的是45吨，这批货物有多少吨？
．
= 
×3= 
÷5= （
+
）×72=
×12= 
÷
= 
= 
= 
=
= 
= 
= 
=
= 
÷
= 
×
= 
+
=
÷6= 
+
= 6÷
=
﹣
= 
×
= 
×
= 0÷
=
= 
÷7= 
÷
= 4×1
= 
×
= 
÷
=
÷5= 5×
= 
﹣
= 
+0.5= 1
÷1= 1÷1
=
的
是多少？
是45吨，这批货物有多少吨？
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