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)
答
(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
答
(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