1.x^2-5x+32.x^2-2√2-33.3x^2+4xy-y^24.(x^2-2x)^2-7(x^2-2x)+121.[x-(5+√13)/2][x-(5-√13)/2]2.(x-√2-√5)(x-√2+√5)3.3[x+(2-√7)y][x+(2+√7)y]4.(x-3)(x-1)(x-1-√5)(x-1+√5)

Question

1.x^2-5x+3
2.x^2-2√2-3
3.3x^2+4xy-y^2
4.(x^2-2x)^2-7(x^2-2x)+12
1.[x-(5+√13)/2][x-(5-√13)/2] 2.(x-√2-√5)(x-√2+√5)
3.3[x+(2-√7)y][x+(2+√7)y] 4.(x-3)(x-1)(x-1-√5)(x-1+√5)

Answer 1

1、公式法,先求方程的跟
2、平方差公式
3、十字交叉,也可以用公式法,把y 看成常数
4、公式法,连续用两次