Cho biểu thức: A= (\(\left(\frac{1}{\sqrt{x}-\sqrt{x-1}}-\frac{x-3}{\sqrt{x-1}-\sqrt{2}}\right)\left(\frac{2}{\sqrt{2}-\sqrt{x}}-\frac{\sqrt{x}+\sqrt{2}}{\sqrt{2x}-x}\right)\) với x\(\ge1,\ne2,\ne3\)

a, rút gọn biểu thức A

b, Tính giá trị của A với x= 3+ \(2\sqrt{2}\)

help me .-.

c1 :Cho \(\left(x+\sqrt{x^2+3}\right)\left(y+\sqrt{y^2+3}\right)\) = 3

Tính E = x+y

c1 : Rút gọn biểu thức

\(\frac{5+\sqrt{5}}{5-\sqrt{5}}+\frac{5-\sqrt{5}}{5+\sqrt{5}}\)

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