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歡迎您訪問數(shù)學(xué)考題練習(xí):若,點M(a,b)在反比例函數(shù)的圖象上,則反比!

數(shù)學(xué)考題練習(xí):若,點M(a,b)在反比例函數(shù)的圖象上,則反比

更新時間:2024-01-12 16:25:04作者:貝語網(wǎng)校

若,點M(a,b)在反比例函數(shù)的圖象上,則反比例函數(shù)的解析式為

A.

B.

C.

D.

試題答案

A

試題解析

首先根據(jù)非負(fù)數(shù)的性質(zhì)可求出a、b的值,進(jìn)而可求出點M的坐標(biāo),代入解析式可求出k的值,據(jù)此即可解答.

解答:,

∴a-1=0,b+3=0,

∴a=1,b=-3;

代入可得k=-3,即反比例函數(shù)的解析式為.

故選A.

點評:本題考查了非負(fù)數(shù)的性質(zhì),初中階段有三種類型的非負(fù)數(shù):(1)絕對值;(2)偶次方;(3)二次根式(算術(shù)平方根).當(dāng)它們相加和為0時,必須滿足其中的每一項都等于0.根據(jù)這個結(jié)論可以求解這類題目.

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