1994 + 1993 X 1995
=1994 + 1994 x 1995 -1995
=1994 x 1995 -1
以此类推:1995 + 1994 x 1996 =1995 x 1996 - 1
1996 + 1995 x 1997 = 1996 x 1997 - 1
所以 (1994 + 1993 x1995)/(1994 x 1995 - 1)=1
(1995 + 1994 x 1996)/(1995 x 1996 - 1)=1
(1996 + 1995 x 1997)/(1996 x 1997 - 1)=1
(1994×1995-1)分之(1994+1993×1995)+(1995×1996-1)分之(1995+1994×1996)+(1996×1997-1)分之(1996+1995×1997) =3