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歡迎您訪問數(shù)學(xué)考題練習(xí):經(jīng)過點A(1,-2)的反比例函數(shù)解析式為!

數(shù)學(xué)考題練習(xí):經(jīng)過點A(1,-2)的反比例函數(shù)解析式為

更新時間:2024-01-12 16:34:03作者:貝語網(wǎng)校

經(jīng)過點A(1,-2)的反比例函數(shù)解析式為

A.y=

B.y=-

C.y=

D.y=-

試題答案

B

試題解析

設(shè)出反比例函數(shù)的解析式,然后把點(1,-2)代入,從而求出反比例函數(shù)的解析式.

解答:設(shè)反比例函數(shù)的解析式為y=,

把點A(1,-2)代入反比例函數(shù)的解析式得

-2=k,

∴反比例函數(shù)的解析式為,y=-.

故選B.

點評:此題比較簡單,考查的是用待定系數(shù)法求反比例函數(shù)的解析式,是中學(xué)階段的重點.

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