一道数学题,就说有技巧的是这样的:[1/2/(1+1/2)]+[1/3/(1+1/2)(1+1/3)]``````````````[1/1999/(1+1/2)(1+1/3)```````(1+1/1999)]=?怎么算啊,

　　一道数学题,就说有技巧的

　　是这样的:[1/2/(1+1/2)]+[1/3/(1+1/2)(1+1/3)]``````````````[1/1999/(1+1/2)(1+1/3)```````(1+1/1999)]=?

　　怎么算啊,