Giải các pt
$a, 18x^2-18x\sqrt{x} -17x-8\sqrt{x} -2=0$
$b, x^2-3x+1=-\frac{\sqrt{3} }{3}.\sqrt{x^4+x^2+1}$
$c, \sqrt{2-x^2} +\sqrt{2-\frac{1}{x^2}} =4-x-\frac{1}{x}$
$d, 2x^2+\sqrt{1-x} +2x\sqrt{1-x^2} =1$
$e, \sqrt[4]{17-x^8} -\sqrt[4]{2x^8-1}=1$
$g, x+\sqrt{4-x^2} =2+3x\sqrt{4-x^2}$
$h,\sqrt[3]{81x-8} =x^3-2x^2+\frac{4}{3}x-2$
$l, \sqrt{5x^2+14x+9} -\sqrt{x^2-x-20} =5\sqrt{x+1} $