Question

phân tích thành nhân tử

\(xy-3x-y^2 +3y\)

\(x^2 +2x-xy-2y\)

\(x^2 +5xy+x+5y\)

Answer 1

1, (x-y)(x-3)

Answer 2

2,(x-y)(x+2)

Answer 3

3,(x+1)(x+5y)

Answer 4

1: =(xy-3x)-(y^2-3y)

=x(y-3)-y(y-3)

=(x-y)(y-3)

2: =(x^2-xy)+2x-2y

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

=(x-y)(x+2)

3: =(x^2+5xy)+(x+5y)

=x(x+5y)+(x+5y)

=(x+5y)(x+1)