王师傅要做一个底面直径2分米，高9分米的圆柱形通风管，至少需要多少平方分米的铁皮？
直接写得数=== 3÷8=========
直接写出得数． 93= 8.7﹣7=÷1= 21÷7= 7×÷7×= 44÷= 75÷10%= 0.9+99×0.9=
直接写出得数．
直接写出得数．÷=+=÷=×= 1÷0.25=÷1=÷3=﹣=
直接写出得数．÷=×3= 6×=+×7= 100÷10%=÷1=÷7=
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= 3÷8=
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= 21
÷7=
÷7×
= 75÷10%= 0.9+99×0.9=
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×
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÷1=
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×3= 6×
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×7=
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