(m^2-6mn+9n^2)÷(m-3n)-(4m^2-9n^2)÷(2m-3n),其中m=-3,n=-1/3(m^2-6mn+9n^2)÷(m-3n)-(4m^2-9n^2)÷(2m-3n),其中m=-3,n=-1/3

(m^2-6mn+9n^2)÷(m-3n)-(4m^2-9n^2)÷(2m-3n),其中m=-3,n=-1/3(m^2-6mn+9n^2)÷(m-3n)-(4m^2-9n^2)÷(2m-3n),其中m=-3,n=-1/3 (m^2-n^2/mn)^2÷(m+n)^2*(m/m-n)^3 化简 m-n=7 mn=-5求(3m+5n+4mn)-(2n-4n+6mn) 【 】÷【mn】=2m-3n (m的平方-6mn+9n的平方)÷(m-3n)-(4m的平方-9n的平方)÷(2m-3n)= （m²-6mn+9n²）÷（m-3n）-（4m²-9n²）÷（2m-3n）化简, (m²-6mn＋9n²）÷（m-3n）-（4m²-9n²）-（2m-3n）怎么做 若m-n=4,mn=-1求(9-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn) 已知m^2+9n^+6m+6n+10=0,求(m^2-6mn+9n^2)÷(m-3n)-(4m^2-9n^2)÷(2m-3n)的值 先化简再求值,3m^2-mn/9m^2-6mn+n^2其中m=3n 计算:[-m^3n/(m-n)^2]^4*[(n^2-mn)/m]^3/m^4n^10*[(mn-n^2)/m]^6 1/M+1/N=5 (3M+MN+2N) / (M-MN=3N) 化简(m²/m-n - m+n)÷2m²-mn/n - m (5mn-2m+3n)+(-7m-7mn) (5mn-2m+3n)+(-7m-7mn) 已知MN^2=-6,求-MN(M^2N^5-MN^3-N)的值 已知m-n=2 则3m^2-6mn+3n^2-9= 计算(2m-3n)(4m^2+6mn+9n^2)