(-1×1/2)+(-1/2×1/3)+(-1/3×1/4)+...+(-1/2004×1/2005)
计算;(1-2平方/1)(1-3平方/1)(1-4平方/1)...(1-2004平方/1)(1-2005平方/1)
1/1*2+1/2*3+1/3*4+…+1/2004*2005(以上/代表乘号)
(1-1/2004)+(2-1/2004*2)+(3-1/2004*3)+.+(2004-1/2004*2004)
计算:(1/2006-1)*(1/2005-1)*(1/2004-1)*.*(1/3-1)*(1/2-1))
1/1*2+1/2*3+1/3*4+.+1/2004*2005+1/2005*2006
2004*(1-2分之1)*(1-3分之1)*(1-3分之1)*(1-4分之1)*.*(1-2004分之1)
1/1*2+1/3*4+1/4*5+...+1/2004*2005+1/2005*2006,
(1-1/2)(1/3-1)(1-1/4)(1/5-1)……(1/2003-1)(1-1/2004)
计算:(1/2+1/3+1/4+…+1//2006)(1+1/2+1/3+…+1/2005)-(1+1/2+1/3+1/
(1-1/2-1/3-1/4-……-1/2003)(1/2+1/3+1/4+...+1/2004)-(1-1/2-1/3
计算:(2+1/2003+1/2004+1/2005)*(1/2003+1/2004+1/2005+1/2006)—(2
计算:(2+1/2003+1/2004+1/2005)*(1/2003+1/2004+1/2005+1/2006)-(2