m^2+n^2=5 x^2+y^2=402,求(mx+ny)^2+(nx-my)^2的值答案是不是2010?

2m+n 5 3 2m-n诺4x y 与x y 是同类项,m/n= 如果x^m-n×x^2n+1=x^11,y^m-1×y^4-n=y^5,求(-2)^m×(-1)^n的值 已知单项式M,N满足3x(M-5x)=6x^2y^3+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) 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 (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= 若3x^m+1y^2与x^3y^n的积是单项式3x^5y^5则n^m+m^n= 】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) 2m+n=x 2n+m=y 求m-n的最小值 已知x^m+n=9,y^m+n=16,求（-三分之一*x^m*y^n)^2*x^2n*y^2n的值? 已知x^m+n=9,y^m+n=16,求（-三分之一*x^m*y^n)^2*x^2n*y^2n的值? 4x^(m+6)y^2+X^3y^n=单项式,m^n= (x+y)(m+n)2-(x+y)(m+n)2 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^n*y*(-x^2y^m) 已知单项式M N满足3x(M-5x)=6x^2y^2 求M N m(x-y)^n+n(y-x)^2n因式分解 2x^2m-n y^3m-2n 与5x^2n y^5是同类项,则m= ,n=