把一块面积为50平方米的长方形地平均分成7块，每块占总面积的几分之几？每块是多少平方米？（用分数表示）
直接写得数4÷= 0×= ÷= ×1.4= ×=0÷= ×10= 30×0.05=
直接写出得数．= = = == = = =
口算．4.2÷= ×3= ÷5= （+）×72=×12= ×1.8= ÷=
= = = == = = =
直接写出得出．20×= ÷= ×= +=÷6= ×12= += 6÷=﹣= ×= ×= 0÷=
= 0×
= 
÷
×1.4= 
×
= 
×10= 30×0.05=
= 
= 
= 
=
= 
= 
= 
=
= 
×3= 
÷5= （
+
）×72=
×12= 
÷
= 
= 
= 
=
= 
= 
= 
=
= 
÷
= 
×
= 
+
=
÷6= 
+
= 6÷
=
﹣
= 
×
= 
×
= 0÷
=
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