(m-2n)的平方+(n+2m)的平方_数学解答

(m-2n)的平方+(n+2m)的平方

人气：169 ℃　时间：2020-03-26 08:47:45

解答

=[(m-2n)+(n+2m)][(m-2n)-(n+2m)]
=(m-2n+n+2m)(m-2n-n-2m)
=(3m-n)(-m-3n)
=-(3m-n)(m+3n)