因式分解x^2-2xy-3y^2+8y-4

分类: 作业答案 • 2022-06-13 13:00:42

问题描述：

答

=(x-3y)(x+y)+8y-4
=(x-3y+2)(x+y-2)

答

原式=(x²-2xy+y²)-(4y²-8y+4)
=(x-y)²-(2y-2)²
=(x-y+2y-2)(x-y-2y+2)
=(x+y-2)(x-3y+2)