(1/2+1/3+...+1/2004)(1+1/2+...+1/2003)-(1+1/2+..+1/2004)(1/2
(1-1/2004)+(2-1/2004*2)+(3-1/2004*3)+.+(2004-1/2004*2004)
(1/2+1/3+.+1/2004)乘(1+1/2+.+1/2003)减(1+1/2+.1/2004)乘(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
(根号3+1)^2004-2(根号3+1)^2003-2(根号3+1)^2002+2004
化简(1/2+1/3+...1/2003)*(1+1/2+...1/2004)-(1+1/2+...1/2004)*(1
(1-1/2-1/3-1/4-……-1/2003)(1/2+1/3+1/4+...+1/2004)-(1-1/2-1/3
(1-1/2)(1/3-1)(1-1/4)(1/5-1)……(1/2003-1)(1-1/2004)
计算:(2+1/2003+1/2004)x(1/2003+1/2004+1/2005)—(2+1/2003+1/2004
1\2004+2/2004+3/2004+4\2004+5\2004+……+2002\2004+2003\2004
1+(-2)+3+(-4)+.+2003+(-2004)
简算:1/2004+2/2004+3/2004+4/2004+.+2002/2004+2003/2004