1.x^2 + 2√3 x - 2
=(x+√3+√5)(x+√3-√5)
2.2x^2 - 8xy + 5y^2
=(x-2y+√6*y/2)(2x-4y-√6*y)
或=(x-2y-√6*y/2)(2x-4y+√6*y)