giải pt
a) \(x+\sqrt{4-x^2}-3x\sqrt{4-x^2}=2\)
b) \(2\left(\sqrt{4-x^2}+4\right)\left(\sqrt{x+2}+\sqrt{2-x}\right)-5=0\)
c) \(\left(\sqrt{x^2-4}-x+1\right)\left(\sqrt{x-2}+\sqrt{x+2}\right)+2=0\)
d) \(\sqrt{x+2}-\sqrt{x-1}=\frac{6}{\sqrt{x^2+x-2}-x}\)
e) \(\frac{2}{\sqrt{x-1}+\sqrt{3-x}}=1+\sqrt{3+2x-x^2}\)