2m/m-n=( )/(n-m)²
[(m+n)(m-n)-(m-n)²+2n(m-n)]÷4n
(m+n)²-6(m+n)+9=(m+n)²+2(m+n)×(-3)+(-3)²=[(m+
n=m/M
先化简再求值[(m+n)(m-n)-(m-n)²]÷(2n),其中m=-2,n=-1/2
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))
化简 m²(m-n)+(n-m)
化简m/(m+n)²+n/m²-n²-2n²/(m+n)(m²-n
已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=?
先化简(m/m-n-n/m+n+2mn/m²-n²)²÷m²+mn/m,若m=1
先化简再求值:(2m-n)(m+n)+(m-n)²-(6m³-4m²n)÷2m,其中m=2
先化简,再求值.8m(m+n)²-2m(m-n)² m=1 n=2
化简(m²/m-n - m+n)÷2m²-mn/n - m