Question

[BangBangTan]

Bài 3:

B= \(\left[\left(\frac{1}{\sqrt{x}}+\frac{1}{\sqrt{y}}\right)\times\frac{2}{\sqrt{x}+\sqrt{y}}+\frac{1}{x}+\frac{1}{y}\right]\div\frac{\sqrt{x}^3+y\sqrt{x}+x\sqrt{y}+\sqrt{y}^3}{\sqrt{x^3y}+\sqrt{xy^3}}\)

a)Tìm ĐKXĐ

b)Rút gọn

c)Tìm x,y để B min