(x^2y^6)^n+3(-xy^3)^2n+2(-x^ny^3n)^2

(x^2y^6)^n+3(-xy^3)^2n+2(-x^ny^3n)^2 若x^2n=2,(y^n)^3=3,则(xy)^6n等于? 若x^2n=2,（y^n)^3=3,则（xy)^6n= x^2n=3,y^3n=4 (xy)^6n=? 】已知:【M】=-5x^2+3xy-2y^2,【N】=5x^2-6xy+2y^2.求：M-N、M+N、N-(M-N)】已知:【M】=-5x^2+3xy-2y^2,【N】=5x^2-6xy+2y^2求：M-N、M+N、N-(M-N) x^2-xy-6y^2+3xy+y+2 （X-3xy+4xy-y）-[-2x-2（xy-3/2xy）-y]+6xy的过程 xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2 若-2x^2*y(-x^m*y+3xy^3)=2x^5y^2-6x^3y^n,求m,n的值? 关于x、y代数式x^2-(3m-3)xy+5y-6xy^3-（1/3n+1)y^3+3x不含xy和y^3项,求3m-2n的值. (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)答案应为-2x-x*x-3x， (xy^3n)^2 +(xy^6)^n 已知m=4x^2-2xy-6y^2,n=2x^2+xy-3y^2求m-2n的值 若X^n=2,y^n=3,则(xy)^n=（ ）,(x^2y^3)^n=( ) 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 3xy(x^2y-xy^2+xy)-xy^2(2x^2-6xy+2x)过程 5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2) 关于x,y得多项式（5m+1)x^2y+(4n-2)xy^2-3x+y-(-2m-6)x^2y+(3-3n)xy^2 不含三次项,求5m+2n的值关于x,y的多项式（5m+1)x^2y+(4n-2)xy^2-3x+y-(-2m-6)x^2y+(3-3n)xy^2 不含三次项,求5m+2n的值