Question

[luong viet]

phan tich da thuc thanh nhan tu

a) xy-y²+2x-2y

b) x²+2xy+y²-9

Answer 1

[Nguyễn Anh Quân]

a, = (xy-y^2) + (2x-2y) = y(x-y) + 2.(x-y) = (x-y).(y+2) 

b, = (x+y)^2 - 9 = (x+y-3).(x+y+3)

Answer 2

[vu tuananh]

\(xy-y^2-2x-2y\)   

=(xy-y).(2x-2y)

=y(x-y).2(x-y)

=(x-y).(y-2)