3(m^2-mn+2n^2)-2(mn-m^2+n^2)+(5mn-4n^2+1)

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/11/07 21:48:13

原式=3m^2-3mn+6n^2-2mn+2m^2-2n^2+5mn-4n^2+1
=5m^2+1
再问：（2x-3y+z)-3(x-2(-z+(x-y))-(3y-5z)
再答：原式=2x-3y+z-3(x+2z-2x+2y)-3y+5z =2x-6y+6z-3x-6z+6x-6y =5x-18y

若m-n=4,mn=-1,求(-2mn+m+n)-(3mn+5n-5m)-(m+4n-3mn)的值 3(m^2-mn+2n^2)-2(mn-m^2+n^2)+(5mn-4n^2+1) 3(m^2n+mn)-4(mn-2m^2n)+mn. 已知m-n=2,mn=1,求多项式(2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值已知｜m-n-2｜与（mn-1)^互为相反数,求（-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值若m-n=4,mn=-1求(9-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn) 若m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值已知m-n=3,mn=-1,求多项式-2mn+2m+3n-3mn-2n+2m-4n-m-mn的值已知MN^2=-6,求-MN(M^2N^5-MN^3-N)的值已知m-n=4,mn=2,求多项式（-2mn+2m+3n)-(3mn+2n-2n)-(m+4n+mn)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