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歡迎您訪問數(shù)學考題練習:已知分式的值是零,那么x的值是!

數(shù)學考題練習:已知分式的值是零,那么x的值是

更新時間:2024-01-12 16:28:42作者:貝語網(wǎng)校

已知分式的值是零,那么x的值是

A.-2

B.0

C.2

D.±2

試題答案

C

試題解析

分式的值為0的條件是:分子為0,分母不為0,兩個條件需同時具備,缺一不可.據(jù)此可以解答本題.

解答:∵=0,

∴x-2=0且x+2≠0,

解得x=2,

故選C.

點評:此題考查的是對分式的值為0的條件的理解,該類型的題易忽略分母不為0這個條件.

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