giải phương trình ( đặt ẩn phụ )
1)\(\sqrt{2x+\sqrt{4x^2-1}}\)+\(\sqrt{2x-\sqrt{4x^2-1}}\)=2
2)(x+5)(2-x)=3.\(\sqrt{x^3+3x}\)
3) 4x2 +10x+9=5. \(\sqrt{2x^2+5x+3}\)
4) \(\frac{x}{x+1}-2\sqrt{\frac{x+1}{2}}\)=3
5)\(\sqrt{x+1}\)+\(\sqrt{4-x}\)+\(\sqrt{\left(x+1\right)\left(4-x\right)}\)=5
6) \(\sqrt{2-x}\)+\(\sqrt{x+2}\)+\(\sqrt{4-x^2}\)=2