1/1*2+1/2*3+1/3*4+1/4*5...+1/2002*2003+1/2003*2004+1/2004*20
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1/1*2+1/2*3+1/3*4+1/4*5...+1/2002*2003+1/2003*2004+1/2004*2005
1/n(n+1)=1/n-1/(n+1)
1/1*2+1/2*3+1/3*4+1/4*5...+1/2002*2003+1/2003*2004+1/2004*2005
=1/1-1/2+1/2-1/3+1/3-1/4+……+1/2003-1/2004+1/2004-1/2005
=1-1/2005
=2004/2005
1/1*2+1/2*3+1/3*4+1/4*5...+1/2002*2003+1/2003*2004+1/2004*2005
=1/1-1/2+1/2-1/3+1/3-1/4+……+1/2003-1/2004+1/2004-1/2005
=1-1/2005
=2004/2005
1\2004+2/2004+3/2004+4\2004+5\2004+……+2002\2004+2003\2004
简算:1/2004+2/2004+3/2004+4/2004+.+2002/2004+2003/2004
(-1)+(+2)+(-3)+(+4)+...(-2001)+(+2002)+(-2003)+(+2004)
1-2+3-4+5-6+...-2002+2003-2004
计算(-1)+(+2)+(-3)+(+4)+...+(-2001)+(+2002)+(-2003)+(+2004)
(-1)+(+2)+(-3)+(+4)...(-2001)+(+2002)+(-2003)+(+2004) 简便运算
(1+3+5.+2001+2003+2005)-(2+4+6.+2000+2002+2004)=?
(-1)+(+2)+(-3)+(+4)+.+(+2003)+(-2003)+(+2004)+(-2005)
(根号3+1)^2004-2(根号3+1)^2003-2(根号3+1)^2002+2004
2003+2002*2004分之2003*2004-1
计算:1*2分之1+2*3分之一+3*4分之一...+2002*2003分之一+2003*2004分之一
|1/2004-1/2003|+|1/2002-1/2003|+.+|1/2-1|等于多少 |1/2004-1/2003