化简：m-n+1/2(m+2n)-4/m+2n-1/2(m-n)求解~~

(1),(-m-n)(-m+n) (2),(-m+n)(m-n) （m-n)2(n-m)3(n-m)4化简 化简,1.[(m+n-p)(m+p+n)-(m+n)²]/(-p),2.[(m+n)(m-n)-(m-n)²+2n(m-n)]/4n 分式加减法：化简：2m/m-n-n/n-m+m+2n/n-m 化简：[3m^(n+4)+2m^(n+1)]/[3m^(n-1)]-[m^3-1/3][m^3+3] 化简：m-n+1/2(m+2n)-4/m+2n-1/2(m-n)求解~~ [(m+n)(m-n)-(m-n)²+2n(m-n)]÷4n (m+n)（m-n）-（1-2n)化简 4m(m-m)-2n(n-m) (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 (m-2n)(-m-n) m-n^2+m-n^2 化简 化简：M-[N+(2M-N)]