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歡迎您訪問數(shù)學(xué)考題練習(xí):去括號正確的是!

數(shù)學(xué)考題練習(xí):去括號正確的是

更新時(shí)間:2024-01-12 16:29:44作者:貝語網(wǎng)校

去括號正確的是

A.a2-(a-b+c)=a2-a-b+c

B.5+a-2(3a-5)=5+a-6a+10

C.3a-(3a2-2a)=3a-a2-a

D.a3-[a2-(-b)]=a3-a2+b

試題答案

B

試題解析

根據(jù)負(fù)正得負(fù),負(fù)負(fù)得正,正正得正即可進(jìn)行各選項(xiàng)的判斷,從而得出答案.

解答:A、a2-(a-b+c)=a2-a+b+c,故本選項(xiàng)錯(cuò)誤;

B、5+a-2(3a-5)=5+a-6a+10,故本選項(xiàng)正確;

C、3a-(3a2-2a)=3a-a2+a,故本選項(xiàng)錯(cuò)誤;

D、a3-[a2-(-b)]=a3-a2-b,故本選項(xiàng)錯(cuò)誤.

故選B.

點(diǎn)評:本題考查去括號的知識,難度不大,注意掌握負(fù)負(fù)得正這個(gè)知識點(diǎn).

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