Question

若x＞0,y＞0且≤a·(+)成立，則a的最小值是

A.                                                            B.

C.2                                                                 D.2

Answer 1

A

解析:

本題主要考查≥()²,參數隔離法.

由≥()²，

∴≥,即a≥,a_min=.故應選A.