1994+1/2-1(1/3)+2(1/2)-3(1/3)+4(1/2)-5(13/)+…+1992(1/2)-1993(1/3)='r.G,\)m8I7\:Y6^+]5j0Z4F)M1\3y'\/L:J;{:H
算式:提示3`6F-[+q)^.A8r0b-G2`1a/U8z+Y,y/v+e(_+U1U:J;{:H