分解因式:(x+2y)(x-2y)-(x-4y)(x+4y)+(6y-5x)(6x-5y)

分类: 作业答案 • 2021-12-28 10:53:57

问题描述：

答

(x+2y)(x-2y)-(x-4y)(x+4y)+(6y-5x)(6x-5y)
= x^2-4y^2-x^2+16y^2+36xy-30y^2-30x^2+25xy
= -18y^2+61xy-30x^2