已知x=3,y=1/3,求x^2n*(xy^n+1)^2的值

已知x^n=5,y^n=3,求(x^2y)^2n 已知 x=2 ,y=二分之一 求 (x^3) * (x^3n) * (y^n+1) ^3 已知 x ^3n-2 ÷x^ n+1 =x^3-n×x^n+2,求n的值 已知M={y|y=x²-4x+3,x∈R},N={y|y=-x²+2x+8,x∈R},求M∩N 答案是{y|-1≤y≤9} 已知方程组2x-3y=2n+1;x+6y=n+2的解x、y的和为12,求n的值 已知M={(x,y)|y=-x^2+mx-1},N={(x,y)|y=-x+3,0 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 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)=6x^2y^2+N,求M、N. 已知,单项式M,N满足2x（M+3x)=6x²y²+N,求M,N 已知集合A={x,xy,lg(xy)},N={0,|x|,y},并且M=N,求(x+1/y)+(x^2+1/y^2)+(x^3+1/y^3)+……+(x^2006+1/y^2006)的值. 规定X@y=Xx(X+1)x(X+2)x.x(X+y-1),如2@4=2x3x4x5已知n+1/n@3=1/575,求自然数n 已知x(x+1)-(x²+y)=3求2/x²+y²-xy 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 已知|x|=2,|y|=3,|x+y|=-(x+y)求x-y 已知x^n=2,y^n=3,求（x^2y)^2n的值. 已知x^n=5,y^n=3,求(x^2y^2)^2n的值 已知x^n=5,y^3,求（xy)^2n和(x^2y^3)^n的值