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歡迎您訪問數學考題練習:若將(a、b均為正數)中的字母a、b的值分別擴!

數學考題練習:若將(a、b均為正數)中的字母a、b的值分別擴

更新時間:2024-01-12 16:26:08作者:貝語網校

若將(a、b均為正數)中的字母a、b的值分別擴大為原來的3倍,則分式的值

A.擴大為原來的3倍

B.縮小為原來的

C.不變

D.縮小為原來的

試題答案

D

試題解析

依題意分別用3a和3b去代換原分式中的a和b,利用分式的基本性質化簡即可.

解答:=

=

=

=•.

故選D.

點評:解題的關鍵是抓住分子、分母變化的倍數,解此類題首先把字母變化后的值代入式子中,然后約分,再與原式比較,最終得出結論.

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