Question

分解因式 的几道题(1) x^2-2xy+y^2-1=(2)k(x-y)^2+(y-x)^2=(3)x^2-xy-6x+

Answer 1

(1) x^2-2xy+y^2-1=(X-Y)^2-1=(X-Y+1)*(X-Y-1)(2)k(x-y)^2+(y-x)^2=(y-x)^2*(k+1)（1）ax+bx+2a+2b=x*(a+b)+2*(a+b)=(a+b)*(x+2)(3)x^2-2x-4xy+4y^2+4y=(x-2y)^2-2(x-2y)=(x-2y)(x-2y-2)