求阴影部分的面积（单位：厘米）
一块2公顷的菜地，平均分成5份．每份是多少公项？其中3份种白菜，种白菜的面积占这块菜地的几分之几？
直接写结果．1÷= ×= ÷=+×= ÷= ÷2=÷= 1÷7×= ×=÷= ÷= ×÷×=
÷7= ×= 6÷= +=16×= ÷= ﹣= ×=
直接写得数1÷= ÷10= ××=×= ÷= 6×=
3克盐放入40克水中，盐占水的几分之几？水占盐水的几分之几？
= 
×
= 
÷
=
+
×
= 
÷
÷2=
÷
= 1÷7×
= 
×
=
÷
= 
÷
= 
×
÷
=
÷7= 
×
= 6÷
= 
+
=
÷
= 
= 
×
=
= 
÷10= 
×
×
=
×
= 
÷
= 6×
=
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