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m(3n-m)平方-3n(3n-m)平方+m-3n
人气:299 ℃ 时间:2020-03-16 09:40:07
解答
m(3n-m)^2-3n(3n-m)^2+m-3n
=m(m-3n)^2-3n(m-3n)^2+(m-3n)
=(m-3n)^2(m-3n)+(m-3n)
=(m-3n)[(m-3n)^2+1]
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