已知x-1的绝对值与y-2的绝对值互为相反数,计算1/xy+1/(x+1)(y+1)+1/(x+2)(y+2)+

问题描述:

已知x-1的绝对值与y-2的绝对值互为相反数,计算1/xy+1/(x+1)(y+1)+1/(x+2)(y+2)+

x=1 y=1代入就好了