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歡迎您訪問數學考題練習:下列說法或計算正確的是!

數學考題練習:下列說法或計算正確的是

更新時間:2024-01-12 16:35:18作者:貝語網校

下列說法或計算正確的是

A.在將分式方程化為整式方程時,可將方程兩邊同時乘以x(x-1)

B.函數中,自變量x的取值范圍是x≥5

C.與不是同類二次根式

D.(3-sin30°)0=0

試題答案

A

試題解析

本題涉及分式方程,函數,二次根式,0指數運算的知識,需要從每個問題的要求著手解題.

解答:A、最簡公分母是x(x-1),所以要在方程兩邊乘x(x-1),正確;

B、除了保證根式成立以外,還得保證分母不為0,結果為x>5,錯誤;

C、化簡后是2,兩個是同類二次根式,錯誤;

D、任何不等于0的數的0次冪是1,錯誤.

故選A.

點評:本題需注意當分式與根式相結合時,兩方面都需考慮.

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