化简:mn(m^2+n^2)-n^2(m^2+n^2)
问题描述:
化简:mn(m^2+n^2)-n^2(m^2+n^2)
答
mn(m^2+n^2)-n^2(m^2+n^2)
=(mn-n^2)(m^2+n^2)
=[n(m-n)](m^2+n^2)