问题
解答题
一块长方形地的周长是90米，长和宽的比是5：4，它的面积多少？
答案
一份是：90÷2÷（5+4），
=45÷9，
=5（米）；
长方形地的长是：5×5=25（米），
长方形地的宽是：5×4=20（米），
长方形地面积是：25×20=500（平方米）．
答：它的面积是500平方米．
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一块长方形地的周长是90米，长和宽的比是5：4，它的面积多少？
一份是：90÷2÷（5+4），
=45÷9，
=5（米）；
长方形地的长是：5×5=25（米），
长方形地的宽是：5×4=20（米），
长方形地面积是：25×20=500（平方米）．
答：它的面积是500平方米．
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