giải phương trình:
1) $\sqrt{x+\sqrt{2x-5}-2}+\sqrt{x-3\sqrt{2x-5}+2}=2\sqrt{2}$
2) $\frac{x-3x^{2}}{2}+\sqrt{\left ( 2x^{2}-x+1 \right )\left ( x^{2}+3 \right )}=2$
3) $\sqrt{2x^{2}+x+6}+\sqrt{x^{2}+x+3}=2\left ( x+\frac{3}{x} \right )$
4) $\sqrt{2x^{2}+3x+1}+4x=\frac{1}{x}+3$
5) $\sqrt{2x+5}-\sqrt{3-x}=x^{2}-5x+8$