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歡迎您訪問數學考題練習:矩形的長為x,寬為y,面積為9,則y與x之間的!

數學考題練習:矩形的長為x,寬為y,面積為9,則y與x之間的

更新時間:2024-01-12 14:07:58作者:貝語網校

矩形的長為x,寬為y,面積為9,則y與x之間的函數關系式用圖象表示大致為

A.

B.

C.

D.

試題答案

C

試題解析

根據矩形的面積得到y與x之間的函數關系式,根據x的范圍以及函數類型即可作出判斷.

解答:矩形的長為x,寬為y,面積為9,則y與x之間的函數關系式是:y=(x>0).

是反比例函數,且圖象只在第一象限.

故選C.

點評:本題考查了反比例函數的圖象,注意x的取值范圍x>0,容易出現的錯誤是忽視取值范圍,選擇B.

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