y=(m^2+2n+2)*x-3m^2-6m-1过哪个定点

计算：1.[(m+n)(n-m)-(m+n)^2+3m(m+n)]除以（-2M),其中m=-4,n=2 2.(x+y)(-x+y)-(x-y)^2-(X^2y-xy^2)除 (x+y)(m+n)2-(x+y)(m+n)2 2m+n 5 3 2m-n诺4x y 与x y 是同类项,m/n= 4x^(m+6)y^2+X^3y^n=单项式,m^n= x^n*y*(-x^2y^m) 已知单项式M、N满足2x(M+3x)=6x^2y^2+N,求M、N. 已知单项式M,N满足3x(M-5x)=6x^2y^3+N,求M,N 已知,单项式M,N满足2x（M+3x)=6x²y²+N,求M,N 已知x^m+n=3,y^m-n=2,求代数式(-1/3x^2m+n·y^5m-6n)·(1/2x^m+2n·y^2n-m) (1)(m+n)^3+2m(m+n)^2+m^2(m+n)= (2)[（x-2y)(x+2y)+4(1)(m+n)^3+2m(m+n)^2+m^2(m+n)=(2)[（x-2y)(x+2y)+4(x-y)^2］除以5x=(3)1.2345^2+(0.7655)^2+2.469乘0.7655-2.5^2= 2m+n=x 2n+m=y 求m-n的最小值 已知单项式M、N满足（6x^2y^3-M）/n=-2x+3,求M、N 已知(m+n)x^n·y^m-2·(3xy^2+5x^2·y)=21x^m·y^n+1+35x^m+1·y^n,求m和n m(x-y)^n+n(y-x)^2n因式分解 对于集合M,N,定义M-N={x|x属于M且X不属于N},定义M*N=(M-N)∪(N-M)对于集合M,N,定义M-N={x|x属于M且X不属于N},定义M*N=(M-N)∪(N-M),集合A y=x^2-3X,x是实数,集合A y=2x,x是正实数,则A*B= 已知单项式M N满足3x(M-5x)=6x^2y^2 求M N 若[-3(x+y)^m*(x-y)^2n]^2*[-(x+y)^2]=-a(x+y)^10*(x-y)^12-n,求m,n的值 】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)