9.2×12
= 37
÷9=
×21= 5.089×
=
59×
= 12
÷
=
×
÷×= 
+（
﹣
）÷1
﹣
=
34×3.1+5.1×14﹣6
= 
+
+
+
+
=
3+
+
+
+
+
+
= 4.25×1.32×0.75÷（1
×1）=
9.2×12= 37÷9=×21= 5.089×=
59×= 12÷=×÷×= +（﹣）÷1﹣=
34×3.1+5.1×14﹣6= ++++=
3++++++= 4.25×1.32×0.75÷（1×1）=
，空白部分面积为
，那么这两个部分的面积之比是多少？(圆周率取
)
取近似值
．
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