(2m-n)(3m²n-mn²7mn)

(5mn-2m+3n)+(-7m-7mn)(5mn-2m+3n)+(-7m-7mn)(5mn-2m+3n)+(-7m-7mn)=-2mn-9m+3n解:原式=5mn-2m+3n-7m-7mn=(5mn

(5mn-2m+3n)+(-7m-7mn)(5mn-2m+3n)+(-7m-7mn)(5mn-2m+3n)+(-7m-7mn)=5MN-2M+3N-7M-7MN=-2MN-9M+3N(5mn-2m+3

m-n=7mn=-5求(3m+5n+4mn)-(2n-4n+6mn)m-n=7mn=-5求(3m+5n+4mn)-(2n-4n+6mn)m-n=7mn=-5求(3m+5n+4mn)-(2n-4n+6m

2mn[（2mn）^2-3n（mn+m^2*n）-mn^2]计算2mn[（2mn）^2-3n（mn+m^2*n）-mn^2]计算2mn[（2mn）^2-3n（mn+m^2*n）-mn^2]计算原式=2

2mn[(2mn)²-3n（mn+m²n）-mn²2mn[(2mn)²-3n（mn+m²n）-mn²2mn[(2mn)²-3n（m

已知m-n=7,mn=2求5n-3mn+5m+2已知m-n=7,mn=2求5n-3mn+5m+2已知m-n=7,mn=2求5n-3mn+5m+2知m-n=7,mn=2求5n-3mn+5m+2(m+n)

(7m²-4mn-n²)-(3m²-mn+2n²)求解(7m²-4mn-n²)-(3m²-mn+2n²)求解(7m

7m²n-3mn²+5m²n+2mn²7m²n-3mn²+5m²n+2mn²7m²n-3mn²+5m

急2[mn+(-3m)]-3(2n-mn),m+n=2mn=-3急2[mn+(-3m)]-3(2n-mn),m+n=2mn=-3急2[mn+(-3m)]-3(2n-mn),m+n=2mn=-32[mn

3(m^2n+mn)-4(mn-2m^2n)+mn.要有过程3(m^2n+mn)-4(mn-2m^2n)+mn.要有过程3(m^2n+mn)-4(mn-2m^2n)+mn.要有过程3(m^2n+mn)

1/M+1/N=5(3M+MN+2N)/(M-MN=3N)1/M+1/N=5(3M+MN+2N)/(M-MN=3N)1/M+1/N=5(3M+MN+2N)/(M-MN=3N)M-MN=3N->M=3N

已知m+n=3,mn=2/3,求mn-mn+mn的值已知m+n=3,mn=2/3,求mn-mn+mn的值已知m+n=3,mn=2/3,求mn-mn+mn的值原式提取mn得mn（m+2mn+n-3mn）

计算:[-m^3n/(m-n)^2]^4*[(n^2-mn)/m]^3/m^4n^10*[(mn-n^2)/m]^6计算:[-m^3n/(m-n)^2]^4*[(n^2-mn)/m]^3/m^4n^1

已知mn/m+n=2求3m-5mn+3n/-m+3mn-n已知mn/m+n=2求3m-5mn+3n/-m+3mn-n已知mn/m+n=2求3m-5mn+3n/-m+3mn-n由于:mn/(m+n)=2

已知M+N分之MN=2,求-m+3mn-n分之3m-5mn+3n已知M+N分之MN=2,求-m+3mn-n分之3m-5mn+3n已知M+N分之MN=2,求-m+3mn-n分之3m-5mn+3n答：mn

已知mn/m+n=2,求3m-5mn+3n/（-m）+3mn-n已知mn/m+n=2,求3m-5mn+3n/（-m）+3mn-n已知mn/m+n=2,求3m-5mn+3n/（-m）+3mn-n3m-5

已知mn／m+n=2,求3m-5mn+3n/-m+3mn-n的值已知mn／m+n=2,求3m-5mn+3n/-m+3mn-n的值已知mn／m+n=2,求3m-5mn+3n/-m+3mn-n的值由于:m

(3m^2n^3)/mn)^2(3m^2n^3)/mn)^2(3m^2n^3)/mn)^2(3m^2n^3)/(mn^2)=3m^(2-1)n^(3-2)=3mn原式=3(m^2/m)(n^3/n^2

(3m^2n^3)/(mn^2)(3m^2n^3)/(mn^2)(3m^2n^3)/(mn^2)(3m^2n^3)/(mn^2)=3m^(2-1)n^(3-2)=3mn原式=3(m^2/m)(n^3/

已知m-n=4,mn=2,求多项式（-2mn+2m+3n)-(3mn+2n-2n)-(m+4n+mn)的值已知m-n=4,mn=2,求多项式（-2mn+2m+3n)-(3mn+2n-2n)-(m+4n