(m-2n)(2n+m)-(-3m-4n)(4n-3m)=
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(m-2n)(2n+m)-(-3m-4n)(4n-3m)=(m-2n)(2n+m)-(-3m-4n)(4n-3m)=(m-2n)(2n+m)-(-3m-4n)(4n-3m)=(m-2n)(2n+m)-
(m-2n)(2n+m)-(-3m-4n)(4n-3m)=
(m-2n)(2n+m)-(-3m-4n)(4n-3m)=
(m-2n)(2n+m)-(-3m-4n)(4n-3m)=
(m-2n)(2n+m)-(-3m-4n)(4n-3m)
=m^2-4n^2+16n^2-9m^2
=-8m^2+12n^2
[(m-n)^2*(m-n)^3]^2/(m-n)^4
[(m-n)^2*(m-n)^3]^2/(m-n)^4
4m(m-n)^2+4n(n-m)^3
（m-n)2(n-m)3(n-m)4化简
已知3m=4n,则m/m+n+n/m-n-m^2/m^2-n^2=
[(m+n)(m-n)-(m-n)²+2n(m-n)]÷4n
(m-2n)(2n+m)-(-3m-4n)(4n-3m)=
（3m-4n）（4n+3m)-（2m-n）（2m+n)
[2(m+n)^5-3(m+n)^4+(-m-n)^3]÷[2(m+n)^3]
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（m+4n)(m-n)-6(m+2n)(m-3n)
（m+4n)(m-n)-6(m+2n)(m-3n),
(1),(-m-n)(-m+n) (2),(-m+n)(m-n)
(m-2n)(-m-n)
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