若x>,0y>0,且x+y≤4,则下列不等式中恒成立的?A.1/(x+y)≤1/4 B.1/x+1/A.1/(x+y)≤1/4 B.1/x+1/y≥1 C.√(xy)≥2 D.1/(xy)≥1

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若x>,0y>0,且x+y≤4,则下列不等式中恒成立的?A.1/(x+y)≤1/4 B.1/x+1/A.1/(x+y)≤1/4 B.1/x+1/y≥1 C.√(xy)≥2 D.1/(xy)≥1

若x>,0y>0,且x+y≤4,则下列不等式中恒成立的?A.1/(x+y)≤1/4 B.1/x+1/A.1/(x+y)≤1/4 B.1/x+1/y≥1 C.√(xy)≥2 D.1/(xy)≥1
若x>,0y>0,且x+y≤4,则下列不等式中恒成立的?A.1/(x+y)≤1/4 B.1/x+1/
A.1/(x+y)≤1/4 B.1/x+1/y≥1 C.√(xy)≥2 D.1/(xy)≥1

若x>,0y>0,且x+y≤4,则下列不等式中恒成立的?A.1/(x+y)≤1/4 B.1/x+1/A.1/(x+y)≤1/4 B.1/x+1/y≥1 C.√(xy)≥2 D.1/(xy)≥1
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