用铁皮制作1节通风管，它的长是60cm，底面圆的直径是10cm．至少需要铁皮多少平方厘米？
直接写得数．×4= 6﹣=÷=×=×=÷=÷=÷=
= 2.5== 1== 1×= 3÷1%==．
×0=×=÷=÷=
直接写得数×8=﹣=÷3= 21×= 2÷=÷=×=+=
直接写得数．×6= 30×=÷= 20÷=+=××0=×= 1÷×=﹣50%=÷6=
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×4= 6﹣
=
÷
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×
×
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÷
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= 2.5
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= 1
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= 1
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= 3÷1%=
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×0=
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×8=
﹣
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÷3= 21×
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×6= 30×
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= 20÷
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×0=
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= 1÷
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﹣50%=
÷6=