A、B两点的坐标为(1/k,0)、[0,1/(k+1)]
sk=AO*BO/2=1/[2k(k+1)]
S1+S2+.S1994
=1/2[1/(1*2)+1/(2*3)+1/(3*4).+1/(1994*1995)]
=1/2[1-1/2+1/2-1/3+1/3-1/4+.+1/1994-1/1995]
=1/2(1-1/1995)
=997/1995
A、B两点的坐标为(1/k,0)、[0,1/(k+1)]
sk=AO*BO/2=1/[2k(k+1)]
S1+S2+.S1994
=1/2[1/(1*2)+1/(2*3)+1/(3*4).+1/(1994*1995)]
=1/2[1-1/2+1/2-1/3+1/3-1/4+.+1/1994-1/1995]
=1/2(1-1/1995)
=997/1995