1994+1/2-1又1/3+2又1/2-3又1/3+4又1/2-5又1/3+……+1992又1/2-1993又1/3=1994+ 0 -1+(1/2)-(1/3) + 2-3 +(1/2)-(1/3)+4-5+(1/2)-(1/3)+...+1992-1993+(1/2)-(1/3)=1994-997+997*(1/2 - 1/3) （上式中从第二项起共有...