упростить дробь.....

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

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