请选择CBA/v'D3|+h1r/B-n/@5r9k:m9O的分子扩大3倍,要使分数大小不变,分母应加上(),F:K.i.t-_4p*F*H6`9o
A.12,F:K.i.t-_4p*F*H6`9o
B.24,F:K.i.t-_4p*F*H6`9o
C.36,F:K.i.t-_4p*F*H6`9o