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歡迎您訪問數(shù)學考題練習:下列等式正確的是!

數(shù)學考題練習:下列等式正確的是

更新時間:2024-01-12 14:02:15作者:貝語網(wǎng)校

下列等式正確的是

A.(-x23=-x5

B.x8÷x4=x2

C.x3+x3=2x3

D.(xy)3=xy3

試題答案

C

試題解析

根據(jù)積的乘方,等于把積的每一個因式分別乘方,再把所得的冪相乘;同底數(shù)冪相除,底數(shù)不變指數(shù)相減;合并同類項,只把系數(shù)相加減,字母與字母的次數(shù)不變,對各選項計算后利用排除法求解.

解答:A、應為(-x23=-x6,故本選項錯誤;

B、應為x8÷x4=x6,故本選項錯誤;

C、x3+x3=2x3,正確;

D、(xy)3=x3y3,故本選項錯誤.

故選C.

點評:本題考查合并同類項,積的乘方的性質,同底數(shù)冪的除法,熟練掌握運算性質是解題的關鍵.

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