(m^2+n^2)^2-4m^2n^2 -(8a^2+2b^2)+64a^2b^2 4a^2b^2-(a^2+b^2-c^2)^2 5(a+b)+a+b x-y+m(x-y) a(b+a)-b-1 ab-b-(a-1)记住!

(1),(-m-n)(-m+n) (2),(-m+n)(m-n) [(m+n)(m-n)-(m-n)²+2n(m-n)]÷4n (m-2n)(-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 （m-n)2(n-m)3(n-m)4化简 m-n+2n^2/(m+n) (m-n)^2*(m-n)^4=? 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 4m(m-m)-2n(n-m) (m-2n/n-m)-(n/m-n)= 2(m-n)²-m(m-n) （m-n)(m+n)+(m+n)²-2m² 已知3m=4n,则m/m+n+n/m-n-m^2/m^2-n^2=