giải các pt sau:
a, \(\sqrt{x^2+2x+4}=\sqrt{2-x}\)
b, \(\sqrt{x-2}-3\sqrt{x^2-4}=0\)
c, \(\sqrt{3x^2+6x+7}+\sqrt{5x^2+10x+14}=4-2x-x^2\)
d, \(2\sqrt{3x+1}-\sqrt{x-1}=2\sqrt{2x-1}\)
e, \(\sqrt{2x-1}+x^2-3x+1=0\)
f, \(\sqrt{4x^2-7x-2}=2\sqrt{x^2-1+1}-1\)
g, \(\sqrt{x^2+2x-15}+\sqrt{x^2-8x+15}=\sqrt{4x^2-18x+18}\)
h,\(\sqrt{2-x}+\sqrt{3-x}=2\sqrt{4-x}\)