4m^2-n^2÷()=2m-n
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4m^2-n^2÷()=2m-n4m^2-n^2÷()=2m-n4m^2-n^2÷()=2m-n（4m^2-n^2）÷(2m+n)=2m-n（4m^2-n^2）÷(2m+n)=2m-n
4m^2-n^2÷()=2m-n
4m^2-n^2÷()=2m-n
4m^2-n^2÷()=2m-n
（4m^2-n^2）÷(2m+n)=2m-n
（4m^2-n^2）÷(2m+n)=2m-n
[(m+n)(m-n)-(m-n)²+2n(m-n)]÷4n
(m-n)^2*(m-n)^4=?
(m-2n/n-m)-(n/m-n)=
已知3m=4n,则m/m+n+n/m-n-m^2/m^2-n^2=
[2(m+n)^5-3(m+n)^4+(-m-n)^3]÷[2(m+n)^3]
(m-2n)(2n+m)-(-3m-4n)(4n-3m)=
4m^2-n^2÷()=2m-n
m+n/4m^-n^-m-2m/n^-4m^=
【（m+n）（m-n）-（m-n²）+2n（m-n）】÷4n
.4（m+n)^2*（m+n)^3-7（m+n)（m+n)^4+5（m+n)^5=
1+n-m/m+2n÷m²-n²/m²+4mn+4n²=
(1),(-m-n)(-m+n) (2),(-m+n)(m-n)
(n/m+n/2m^2)*4m/n^2
[(m-n)^2*(m-n)^3]^2/(m-n)^4
[(m-n)^2*(m-n)^3]^2/(m-n)^4
4m^2(m+n)-9n^2(m+n)
因式分解4m^2(m-n)+4n(n-m)
4m(m-n)^2+4n(n-m)^3