1.[1/2(x-y)^2n-(x-y)^1-2n*[-2/3(y-x)^3]2.x^n-5*(x^n+1*y^3m-2)^2-(x^n-1*y^m-2)^3*(-y^3m+2)看这些题我快疯了~TAT是要化简，不过第一题我已经做出来了没有照片啊~TAT

x^n*y*(-x^2y^m) 分解因式 x^n+2 *y^n-2+x^n+1* y^n-1+x^n+1* y^n-1 求和X+1/y+x^2+1/y^2+x^n+1/y^n S=(x+1/y)+(x^2+1/y^2)+.+(x^n+1/y^n) 因式分解x^6 (x-y)^2n+1 + y^6 (y-x)^2n+1 (y-x)^2n×(x-y)^n-1(x-y)= m(x-y)^n+n(y-x)^2n因式分解 解方程：(x-2y)^2n/(2y-x)^2n-1+(2x-y)(-2x-y)+(x-y)(-x+y) (x-2y)的2N次方/(2y-x)的2n-1次方+(2x-y)(-2x-y)+(x-y)(-x+y) y=1/(x^2-x),求y^(n) 求和(x+1/y)+x^2+1/y^2)+...+(x^n+1/y^n)(x,y不等于0) 急. 求和(x+1/y)+x^2+1/y^2)+...+(x^n+1/y^n)(x,y不等于0) 用列举法表示 集合{x|x=(-1)^n,n∈N}{y|y=-x^2+6,x∈N,y∈N}{(x,y)|y=-x^2+6,x∈N,y∈N} x^n+x^n-1y+x^n-2y^2+.+x^2y^n-2 +xy^n-1 +y^n=多少? x^n（y^2n-1）/x^n-1（y^n+1） x^n（y^2n-1）/x^n-1（y^n+1） (x+y)(m+n)2-(x+y)(m+n)2 1.m(x-y-z)+n(y+z-x)=(x-y-z)*?2.x^2-(a+1)x+a+?3.6x^2+7x+2=?