Question

2x2+xy-y2-4x+5y-6

2x2+xy-y2-4x+5y-6怎么算，要简单过程哈，thanks

Answer 1

2x^2+xy-y^2-4x+5y-6

=（x+y）(2x-y)-4x+5y-6

=（x+y）(2x-y)+2(x+y)-6x+3y-6

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

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

Answer 2

大十字相乘法因式分解
2x-y 2
x+y -3

∴2x^2+xy-y^2-4x+5y-6=(2x-y+2)(x+y-3)