因式分解mn(x^2+y^2)+xy(m^2+n^2)

问题描述:

因式分解mn(x^2+y^2)+xy(m^2+n^2)

mn(x^2+y^2)+xy(m^2+n^2)
=mnx^2+mny^2+m^2xy+n^2xy
=(mnx^2+m^2xy)+(mny^2+n^2xy)
=mx(nx+my)+ny(my+nx)
=(mx+ny)(my+nx)