对于任意非零实数a,b定义运算“※”如下:a※b=(a-b)/ab,求:2※1+3※2+4※3+...+2005※200

2※1+3※2+4※3+...+2005※2004
=1/1*2+1/2*3+1/3*4+...+1/2004*2005
=1-1/2+1/2-1/3+1/3-1/4+...+1/2004-1/2005
=1-1/2005
=2004/2005.