约分:(1)2m(m-n)/4m(n-m)^2 (2)2m(m-n)/4m(n-m) (3)m^2-4/2m+m^2 (4)a^2-4a+4/a^2-4 (5)x^2-4x+4/x^2-4约分:(1)2m(m-n)/4m(n-m)^2 (2)2m(m-n)/4m(n-m) (3)m^2-4/2m+m^2(4)a^2-4a+4/a^2-4 (5)x^2-4x+4/x^2-4 (6)a^2+4ab/a^2b+4ab^2(7)先化简,再求值（a^2-4)/(

约分(m-n)^2/(n-m)^3 (1),(-m-n)(-m+n) (2),(-m+n)(m-n) m^2-n^2/(m=n)^2约分 约分m-n分之n^2-m^2 3(m-n)^2/18(n-m)^3怎么约分? 约分： 2n-m/2mn-4n^2 约分:(1)2m(m-n)/4m(n-m)^2 (2)2m(m-n)/4m(n-m) (3)m^2-4/2m+m^2 (4)a^2-4a+4/a^2-4 (5)x^2-4x+4/x^2-4约分:(1)2m(m-n)/4m(n-m)^2 (2)2m(m-n)/4m(n-m) (3)m^2-4/2m+m^2(4)a^2-4a+4/a^2-4 (5)x^2-4x+4/x^2-4 (6)a^2+4ab/a^2b+4ab^2(7)先化简,再求值（a^2-4)/( 4m(m-m)-2n(n-m) (n/m+n/2m^2)*4m/n^2 因式分解4m^2(m-n)+4n(n-m) 4m(m-n)^2+4n(n-m)^3 [(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) （m-n)2(n-m)3(n-m)4化简 (m-2n)(-m-n) [(m+n)(m-n)-(m-n)²+2n(m-n)]÷4n （m-n）²/（n-m）³约分计算.