51问答网 > 一块长方形玻璃,长截去5厘米,宽截去3厘米后是正方形,截去面积为71平方厘米,剩下的正方形面积为？

一块长方形玻璃,长截去5厘米,宽截去3厘米后是正方形,截去面积为71平方厘米,剩下的正方形面积为？

2025-03-15 05:47:38
推荐回答（4个）
回答1：

正方形的边长是（71-5*3）/（5+3）=7厘米，面积是7*7=49平方厘米

回答2：

设正方形边长为x
(x+5)*(x+3)-x*x=71
x=7
正方形为49平方厘米

回答3：

(71-3*5)/(3+5)
=7
剩下的正方形的面积=7*7=49

回答4：

设正方形边长为x
(x+5)(x+3)-x*x=71
8x=56
x=7
面积为 x*x=7*7=49

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