Question

x的平方-4xy+4y的平方-3x+6y=(x-2y)(x-2y+m),那么m=

Answer 1

x^2-4xy+4y^2-3x+6y=(x-2y)(x-2y+m)

左边=(x-2y)^2-3(x-2y)=（x-2y)(x-2y-3)

右边=（x-2y)(x-2y+m)

那么m=-3