一间课室的长是10米,宽是8米,高是4米.要粉刷教室的屋顶和四面墙壁.除去门窗和黑板面积28平方米,粉刷面积为多少?10×8+(10+8)×4×2-28不理解(10+8)×4×2为何答案给的好像是10*8+(10+8)*3*2-28
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![一间课室的长是10米,宽是8米,高是4米.要粉刷教室的屋顶和四面墙壁.除去门窗和黑板面积28平方米,粉刷面积为多少?10×8+(10+8)×4×2-28不理解(10+8)×4×2为何答案给的好像是10*8+(10+8)*3*2-28](/uploads/image/z/536143-31-3.jpg?t=%E4%B8%80%E9%97%B4%E8%AF%BE%E5%AE%A4%E7%9A%84%E9%95%BF%E6%98%AF10%E7%B1%B3%2C%E5%AE%BD%E6%98%AF8%E7%B1%B3%2C%E9%AB%98%E6%98%AF4%E7%B1%B3.%E8%A6%81%E7%B2%89%E5%88%B7%E6%95%99%E5%AE%A4%E7%9A%84%E5%B1%8B%E9%A1%B6%E5%92%8C%E5%9B%9B%E9%9D%A2%E5%A2%99%E5%A3%81.%E9%99%A4%E5%8E%BB%E9%97%A8%E7%AA%97%E5%92%8C%E9%BB%91%E6%9D%BF%E9%9D%A2%E7%A7%AF28%E5%B9%B3%E6%96%B9%E7%B1%B3%2C%E7%B2%89%E5%88%B7%E9%9D%A2%E7%A7%AF%E4%B8%BA%E5%A4%9A%E5%B0%91%3F10%C3%978%2B%EF%BC%8810%2B8%EF%BC%89%C3%974%C3%972-28%E4%B8%8D%E7%90%86%E8%A7%A3%EF%BC%8810%2B8%EF%BC%89%C3%974%C3%972%E4%B8%BA%E4%BD%95%E7%AD%94%E6%A1%88%E7%BB%99%E7%9A%84%E5%A5%BD%E5%83%8F%E6%98%AF10%2A8%2B%EF%BC%8810%2B8%EF%BC%89%2A3%2A2-28)
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