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歡迎您訪問數(shù)學(xué)考題練習(xí):若點(diǎn)A(m,-2)在反比例函數(shù)的圖象上,則當(dāng)函!

數(shù)學(xué)考題練習(xí):若點(diǎn)A(m,-2)在反比例函數(shù)的圖象上,則當(dāng)函

更新時(shí)間:2024-01-12 14:06:50作者:貝語網(wǎng)校

若點(diǎn)A(m,-2)在反比例函數(shù)的圖象上,則當(dāng)函數(shù)值y≥-2時(shí),自變量x的取值范圍是________.

試題答案

x≤-3或x>0

試題解析

先把點(diǎn)A的坐標(biāo)代入函數(shù)解析式求出m的值,然后在兩個(gè)象限內(nèi)利用反比例函數(shù)的性質(zhì)解答.

解答:∵點(diǎn)A(m,-2)在反比例函數(shù)的圖象上,

∴=-2,

解得m=-3,

在第一象限,函數(shù)值y都是正數(shù),所以x>0時(shí),y≥-2,

在第三象限,函數(shù)值y隨x的增大而減小,

所以x≤-3時(shí),y≥-2,

綜上所述,函數(shù)值y≥-2時(shí),自變量x的取值范圍是x≤-3或x>0.

故答案為:x≤-3或x>0.

點(diǎn)評:本題考查了待定系數(shù)法求反比例函數(shù)的解析式,以及反比例函數(shù)的性質(zhì),本題關(guān)鍵在于要分兩個(gè)象限求解x的取值范圍.

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