(m-2n/n-m)-(n/m-n)=
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(m-2n/n-m)-(n/m-n)=(m-2n/n-m)-(n/m-n)=(m-2n/n-m)-(n/m-n)=(m-2n/n-m)-(n/m-n)=(m-2n/n-m)+(n/n-m)=(m-n)
(m-2n/n-m)-(n/m-n)=
(m-2n/n-m)-(n/m-n)=
(m-2n/n-m)-(n/m-n)=
(m-2n/n-m)-(n/m-n)
=(m-2n/n-m)+(n/n-m)
=(m-n)/(n-m)
= -1
(m-2n/n-m)-(n/m-n)=
(1),(-m-n)(-m+n) (2),(-m+n)(m-n)
(m-2n)(-m-n)
(m-n)^3(n-m)^2(m-n)=_____
m-n+2n^2/(m+n)
(3m-n)(m-2n)=()
(m-n)^2*(m-n)^4=?
已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=?
n=m/M
m-[n-3m-(m-n)]=?
2(m-n)²-m(m-n)
（m-n)(m+n)+(m+n)²-2m²
C（m,n）=n(n-1)(n-2)...(n-m+1)/m!中的!
已知3m=4n,则m/m+n+n/m-n-m^2/m^2-n^2=
m/n=5/3,求（m/m+n）+（m/m+n)-（n^2/m^2-n^2)
已知m/n=5、,求（m/（m+n）)+(m/(m-n))-(n^2/(m^3-n^2))
计算m+2n/n-m+n/m-n-2n/n-m
（m-n)+2n（m-n)（m-n)的平方+2n（m-n)因式分解