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(m-2n)(2n+m)-(-3m-4n)(4n-3m)=

分类: 作业答案 • 2021-12-20 12:14:28

问题描述：

(m-2n)(2n+m)-(-3m-4n)(4n-3m)=

答

(m-2n)(2n+m)-(-3m-4n)(4n-3m)
=m^2-4n^2+16n^2-9m^2
=-8m^2+12n^2