m(3n-m)平方-3n(3n-m)平方+m-3n

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m(3n-m)平方-3n(3n-m)平方+m-3n
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m(3n-m)平方-3n(3n-m)平方+m-3n
m(3n-m)平方-3n(3n-m)平方+m-3n

m(3n-m)平方-3n(3n-m)平方+m-3n
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]

(m-3n)(3n-m)²+(m-3n)
= -(3n-m)(3n-m)²-(3n-m)
= -(3n-m)((3n-m)²-1)
= -(3n-m)(3n-m+1)(3n-m-1)

m(3n-m)平方-3n(3n-m)平方+m-3n
=(m-3n)*(3n-m)^2 + (m-3n)
=(m-3n)((3n-m)^2+1)