附加题：在边长4厘米的正方形外面画一个圆．并让正方形的四个顶点都在圆上．求出圆的面积．
直接写出得数．=== 1= 0×==== 20==
直接写出得数：÷=÷3=××=÷2= 6×=×9×= 5÷﹣÷5= 2.7﹣= （1.6+3.2）×0.125=
直接写得数： 12÷=×30=÷= 16×=÷=÷4=÷×1=÷×=÷3=÷6=÷3=÷．
直接写数：==========
直接写得数．×3= 6÷=÷1= 1÷÷=÷= 0.5÷=﹣= 0÷×=
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= 20
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×9×
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×3= 6÷
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