应用题,写出算式,并说理由.1,李师傅用铁片制作30节圆柱形的通风管,每节长90厘米,底面周长62.8厘米,至少要用铁皮多少平方米?2,一个圆柱形水桶,从里面量最高是62.8厘米,把它的侧面展开是正方
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![应用题,写出算式,并说理由.1,李师傅用铁片制作30节圆柱形的通风管,每节长90厘米,底面周长62.8厘米,至少要用铁皮多少平方米?2,一个圆柱形水桶,从里面量最高是62.8厘米,把它的侧面展开是正方](/uploads/image/z/8604849-57-9.jpg?t=%E5%BA%94%E7%94%A8%E9%A2%98%2C%E5%86%99%E5%87%BA%E7%AE%97%E5%BC%8F%2C%E5%B9%B6%E8%AF%B4%E7%90%86%E7%94%B1.1%2C%E6%9D%8E%E5%B8%88%E5%82%85%E7%94%A8%E9%93%81%E7%89%87%E5%88%B6%E4%BD%9C30%E8%8A%82%E5%9C%86%E6%9F%B1%E5%BD%A2%E7%9A%84%E9%80%9A%E9%A3%8E%E7%AE%A1%2C%E6%AF%8F%E8%8A%82%E9%95%BF90%E5%8E%98%E7%B1%B3%2C%E5%BA%95%E9%9D%A2%E5%91%A8%E9%95%BF62.8%E5%8E%98%E7%B1%B3%2C%E8%87%B3%E5%B0%91%E8%A6%81%E7%94%A8%E9%93%81%E7%9A%AE%E5%A4%9A%E5%B0%91%E5%B9%B3%E6%96%B9%E7%B1%B3%3F2%2C%E4%B8%80%E4%B8%AA%E5%9C%86%E6%9F%B1%E5%BD%A2%E6%B0%B4%E6%A1%B6%2C%E4%BB%8E%E9%87%8C%E9%9D%A2%E9%87%8F%E6%9C%80%E9%AB%98%E6%98%AF62.8%E5%8E%98%E7%B1%B3%2C%E6%8A%8A%E5%AE%83%E7%9A%84%E4%BE%A7%E9%9D%A2%E5%B1%95%E5%BC%80%E6%98%AF%E6%AD%A3%E6%96%B9)
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