=1-1/2+1/2-1/3+1/3-1/4+...+1/98-1/99+1/99-1/100=1-1/100=99/1001/1*2=1-1/21/2*3=1/2-1/3……1/99*100=1/99-1/100所以原式=1-1/2+1/2-1/3+……+1/99-1/100中间正负抵消=1-1/100=99/100
一百分之九十九
1-1/2+1/2-1/3+1/3-1/4+...+1/98-1/99+1/99-1/100=1-1/100=99/100