(-3m-n)^2
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(-3m-n)^2(-3m-n)^2(-3m-n)^2=(3m+n)^2=9m^2+6mn+n^2(-3m-n)^2=9m^2+6mn+n^2
(-3m-n)^2
(-3m-n)^2
(-3m-n)^2
=(3m+n)^2=9m^2+6mn+n^2
(-3m-n)^2 =9m^2+6mn+n^2
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(m-n)3-(2n-m)3
2m-3n-m+2n
(3m-n)(m-2n)=()
(m+2n)(m-3n)
(m-3n)(2m+n)
约分(m-n)^2/(n-m)^3
分解因式(2m-n)(2m-n)(2m-n)+3n(n-2m)(n-2m)
已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=?