计算第四部分面积：第一部分面积为20平方米，第二部分面积为50平方米，第三部分面积为40平方米．
直接写出得数．×16=+= 0÷=÷3=÷= 7﹣=×= 8÷=
直接写出得数． 6÷=×= 0÷= 4.1﹣÷=﹣=÷=×8×=化简比0.6：=
直接写出得数．×=×4=×=×= 3×=÷2==×= 12=﹣1÷2=
直接写出得数．×=÷=÷26====×÷=== 1.2÷=
口算．×=÷5= 1÷= 15×= 1.25×=×4=÷= 1.8﹣40%= 12×（+）=×6+4×=
×16=
+
= 0÷
=
÷3=
÷
= 7﹣
=
×
= 8÷
=
=
×
= 0÷
= 4.1﹣
÷
=
÷
=
×8×
=化简比0.6：
=
×
=
×4=
×
×
= 3×
=
÷2=
=
×
= 12
=
﹣1÷2=
×
=
÷
÷26=
=
=
=
×
÷
=
=
= 1.2÷
=
×
=
÷5= 1÷
= 15×
= 1.25×
=
×4=
÷
= 1.8﹣40%= 12×（
+
）=
×6+4×
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