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歡迎您訪問數學考題練習:|3-x|=x-3,則x的取值為!

數學考題練習:|3-x|=x-3,則x的取值為

更新時間:2024-01-12 16:47:27作者:貝語網校

|3-x|=x-3,則x的取值為

A.x>3

B.x<3

C.x≥3

D.x≤3

試題答案

C

試題解析

根據絕對值的意義,由于|3-x|=x-3,則3-x≤0,解得x的值即可.

解答:∵|3-x|=x-3=-(3-x),

∴3-x≤0,

∴x≥3.

故選C.

點評:本題考查了絕對值的意義,即根據絕對值的代數定義去絕對值符號:一個正數的絕對值是它本身,一個負數的絕對值是它的相反數,0的絕對值是0.

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