6m^2n-3m^2n^2-15mn^3

m-n=7 mn=-5求(3m+5n+4mn)-(2n-4n+6mn) 1/M+1/N=5 (3M+MN+2N) / (M-MN=3N) 已知m²-mn=15,mn-n²=-6,求代数式3m²-mn-2n² 已知n^2-mn=15,mn-n^2=-6,求3*m^2-mn-n^2的值 计算:[-m^3n/(m-n)^2]^4*[(n^2-mn)/m]^3/m^4n^10*[(mn-n^2)/m]^6 (5mn-2m+3n)+(-7m-7mn) (5mn-2m+3n)+(-7m-7mn) 已知m^2-m=15 mn-n^2=-6 求3m^2-mn-2n^2=? 已知m^2-m=15 mn-n^2=-6 求3m^2-mn-2n^2=? m^3n-2m^2n^2+mn^3 m²-3mn+2n²+m-n因式分解 因式分解：8mn(n-m)+2(n-m)^3 因式分解：8mn(n-m)+2(n-m)^3, 若(m+n)^2-mn(m+n)=(m+n)·M,则M是（） A.m^2+n^2 B.m^2-mn+n^2 C.m^2-3mn+n^2 D.m^2+mn+n^2 (m-n)(m^5+m^4n+m^3n^2+m²n^3+mn^4+n^5) 已知MN^2=-6,求-MN(M^2N^5-MN^3-N)的值 (m^2-n^2/mn)^2÷(m+n)^2*(m/m-n)^3 化简 急2[mn+(-3m)]-3(2n-mn),m+n=2 mn=-3