Violympic toán 9

PT

1, x + y + z = 2( 2\(\sqrt{x+1}\) + 3\(\sqrt{y+2}\) + 4\(\sqrt{z+3}\) )

2, x^2 + 7x +14 = 2\(\sqrt{x}\) +4

3, 4\(\sqrt{x+1}\) = x^2 - 5x +14

4, 4x^2 + 3x + 3 = 4x\(\sqrt{x+3}\) + 2\(\sqrt{2x-1}\)