边长为3厘米的正方形的每条边都被三等分．以这8个等分点中的4个为顶点画出一个四边形，使其面积为3.5平方厘米．
先看清左右两题之间的关系，再写出得数．
======= 1.05×4= 268÷14×0== 306﹣16= 5.1+0.09=
直接写出得数．﹣=÷= 9÷3= 9.8÷0.7= 3÷×3=÷5=×1.6= 15×60%= 25×40%= 2÷100%=
==== 3.14×5======
直接写出得数． 1﹣40%= ll7%﹣1.02=+40%=﹣24%= 60×15%= 60÷80%=×=÷=
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= 1.05×4= 268÷14×0=
= 306﹣16= 5.1+0.09=
﹣
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÷
= 9
÷3=
×3=
÷5=
×1.6= 15×60%= 25×40%=
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=
=
=
+40%=
﹣24%=
×
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÷
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