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
规定x@y=x*(x+1)*(x+2)*...*(x+y-1),如2@4=2*3*4*5.已知n+1/n@3=1/575
y=(x-1)(x-2)(x-3)(x-4)...(x-n)
若规定x*y=(x+1)(y+4)-(x+2)(y+3),请化简(m+1)*(n-1),并求m=2008,n=2007,
若规定x&y=(x+1)(y+4)-(x+2)(y+3),请化简(m+1)&(n-1),并求m=2008,n=2007时
若1+2+3+...+n=a,求代数式(x^ny)(x^n-1y^2)(x^n-2y^3)...(x^2y^n-1)(x
已知4x=9y求(1)x+y/y (2)y-x/2x
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
设y=x(x-1)(x-2)(x-3)——(x-n),则y^(n+1)=?
若1+2+……+n=k,试探求:(x^n*y)*(x^(n-1)*y^2)*(x^(n-2)*y^3)*……*(x*y^
设y=1/(x*x-3*x-2),求y的n阶导数
已知M={(x,y)|2x+3y=4320,x,y∈N},N={(x,y)|4x-3y=1,x,y∈N},则( )
1、已知x、y互为相反数,且满足x-2y=-3n,2x+y=4n+5,求n的3次方的值