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歡迎您訪問數學考題練習:兩位同學在描述同一反比例函數的圖象時,甲同學說!

數學考題練習:兩位同學在描述同一反比例函數的圖象時,甲同學說

更新時間:2024-01-12 16:27:24作者:貝語網校

兩位同學在描述同一反比例函數的圖象時,甲同學說:這個反比例函數的圖象上任意一點到兩坐標軸的距離的積都是3;乙同學說:這個反比例函數的圖象與直線y=x有兩個交點,你認為這兩位同學所描述的反比例函數的解析式是

A.y=

B.y=-

C.y=-

D.y=

試題答案

A

試題解析

先設反比例函數的解析式y=,根據甲同學說的可知k=±3,根據乙同學說的可知k>0,綜合可得k=3,即得到反比例函數的解析式.

解答:設反比例函數的解析式y=,

根據甲同學說的可知k=±3,

根據乙同學說的可知k>0,

綜合可得k=3,

所以y=.

故選A.

點評:主要考查了用待定系數法求反比例函數的解析式和反比例函數的性質.

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