若x=1 y=2 求：1/xy+1/(x+1)(y+1)+1/(x+2)(y+2)+···+1/(x+2012)(y+2012)
来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/23 19:34:58
若x=1y=2求：1/xy+1/(x+1)(y+1)+1/(x+2)(y+2)+···+1/(x+2012)(y+2012)若x=1y=2求：1/xy+1/(x+1)(y+1)+1/(x+2)(y+2
若x=1 y=2 求：1/xy+1/(x+1)(y+1)+1/(x+2)(y+2)+···+1/(x+2012)(y+2012)
若x=1 y=2 求：1/xy+1/(x+1)(y+1)+1/(x+2)(y+2)+···+1/(x+2012)(y+2012)
若x=1 y=2 求：1/xy+1/(x+1)(y+1)+1/(x+2)(y+2)+···+1/(x+2012)(y+2012)
1/xy+1/(x+1)(y+1)+1/(x+2)(y+2)+···+1/(x+2012)(y+2012)
=1/1x2+1/2x3+1/3x4+...+1/2013x2014
=1-1/2+1/2+1/3+1/3-1/4+...+1/2013-1/2014
=1-1/2014
=2013/2014
若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
1-2/x+y=xy,4y+6x=xy.求xy的解?
若xy满足x²+2x+y-2√y-1=-1,求xy,
若x,y满足x^+2y^-2xy+1=0,求xy的值
若1/x-1/y=1/3,求(2x+3xy-2y)/(x-3xy-y)
若1/x-1/y=3,求(2x+3xy-2y)/(x-2xy-y)的值
若1/x -1/y =3,求(2x+3xy-2y)/(x-y-2xy)
若1/X—1/Y=2,求3X-2XY-3Y/X-2XY-Y
若1/x-1/y=3,求（2x-3xy-2y)/(x-2xy-y)的值
若1/X-1/Y=2,求3X+XY+3Y/X-XY-Y的值
若1/X-1/Y=3,求5X+2XY-5Y/X-4XY-Y
若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值
若(1/x )-(1/y)=3,求(3x+4xy-3y)/(x-2xy-y)的值.
x+y=1,xy=-2求(x²+y²+xy)/(x²+y²-xy)
已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y)
已知xy-x-y=11,求(xy-1)^2+(x+y-2)(x+y-2xy)的值.
已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值