因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+(x-3y)(x-5y)+(x-2y)(x-4y)

问题描述:

因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+(x-3y)(x-5y)+(x-2y)(x-4y)

(x-2y)(x-3y)+(x-4y)(x-5y)+(x-3y)(x-5y)+(x-2y)(x-4y)=(x-2y)[(x-3y)+(x-4y)]+(x-5y)[(x-3y)+(x-4y)]=(x-2y)(2x-7y)+(x-5y)(2x-7y)=(2x-7y)[(x-2y)+(x-5y)]=(2x-7y)(2x-7y)=(2x-7y)^2

(x-2y)(x-3y)+(x-4y)(x-5y)+(x-3y)(x-5y)+(x-2y)(x-4y)= (x-2y)[(x-3y)+(x-4y)]+(x-5y)[(x-4y)+(x-3y)]= (x-2y)(2x-7y)+(x-5y)(2x-7y)= (2x-7y)[(x-2y)+(x-5y)]= (2x-7y)(2x-7y)= (2x-7y)^2