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歡迎您訪問數學考題練習:某小區利用一塊空地修建一個長方形花壇,要使花壇!

數學考題練習:某小區利用一塊空地修建一個長方形花壇,要使花壇

更新時間:2024-01-12 16:25:51作者:貝語網校

某小區利用一塊空地修建一個長方形花壇,要使花壇的長比寬多5m,且面積為24m2,長方形花壇的長和寬應各是多少?

試題答案

解:設花壇的寬為x米,

根據題意得 x(x+5)=24,

整理得:x2+5x-24=0

解這個方程的 x1=3x2=-8(不合題意舍去),

∴x=3x+5=8,

答:長方形花壇的長為8米,寬為3米.

試題解析

設花壇的寬為x米,然后表示出矩形的長,利用矩形的面積計算方法得到方程求解即可.

點評:本題考查了一元二次方程的應用,有關幾何圖形問題是近幾年中考的熱點考題之一,應重點掌握.

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