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歡迎您訪問每日一練:下列各題計算正確的是!

每日一練:下列各題計算正確的是

更新時間:1970-01-01 08:00:00作者:貝語網校

下列各題計算正確的是

A.x6÷x3=x2

B.x6-x3=x3

C.(-x)4÷(-x)2=-x2

D.x2n÷xn=xn

試題答案

D

試題解析

分析:根據同底數冪的除法,底數不變指數相減來計算即可.

解答:A、x6÷x3=x3,故本選項錯誤;

B、x6-x3,不是同類項,不能合并,故本選項錯誤;

C、(-x)4÷(-x)2=x4÷x2=x2,故本選項錯誤;

D、x2n÷xn=xn,故本選項正確;

故選D.

點評:本題考查同底數冪的除法,一定要記準法則才能做題.

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