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歡迎您訪問數學考題練習:用長4米的鋁材制成一個矩形窗框,使它的面積為米!

數學考題練習:用長4米的鋁材制成一個矩形窗框,使它的面積為米

更新時間:2024-01-12 16:28:33作者:貝語網校

用長4米的鋁材制成一個矩形窗框,使它的面積為米2,若設它的一邊長為x米,根據題意列出關于x的方程為

A.x(4-x)=

B.2x(2-x)=

C.x(4-2x)=

D.x(2-x)=

試題答案

D

試題解析

本題依題意可知矩形邊框的周長為4米,即已知矩形相鄰兩邊的和是2,再結合矩形的面積公式得出答案.

解答:依題意得:另一邊長=4÷2-x=2-x,又矩形的面積為:x(2-x)=.故選D.

點評:本題考查的是一元二次方程的運用,要靈活地運用矩形的周長和面積公式對題意進行分析從而列出方程.

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