计算：((1(2/3)+2(3/4)+3(4/5)+…+1994(1995/1996)+1995(1996/1997))/(3(1/3)+5(2/4)+7(3/5)+…+3989(1994/1996)+3991(1995/1997)))=多少． equation:x=(((2-(1/3))+(3-(1/4))+(4-(1/5))+(1995-(1/1996))+(1996-(1/1997)))/(