数学题:求X的长度是多少厘米

  • 时间:2020-05-11 16:38:51
  • 分类:数学世界
  • 阅读:126 次

数学题:如图,正方形边长10厘米,两个直角梯形的高相等,面积相差10平方厘米,求X的长度是多少厘米?

正方形中有两个梯形

数学题解答

为便于区分,这两个梯形分别称为“左梯形”、“右梯形”。两个梯形的高都是5厘米,左梯形与右梯形有一条边重合(左梯形的上底,也是右梯形的下底),所以两个梯形上下底之和相差的正好就是x。

设左梯形上下底之和为a。根据“面积相差10平方厘米”列出方程

a×5÷2 – (a-x)×5÷2 = 10

[a - (a - x)]×5÷2 = 10

x×5÷2 = 10

x=4

答:x的长度是4厘米。

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