(1/2+1/3···+1/2003)(1+1/2+1/3+···+1/2004)-(1+1/2+1/3+···+1/2003)(1/2+1/3+···+1/2004)

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(1/2+1/3···+1/2003)(1+1/2+1/3+···+1/2004)-(1+1/2+1/3+···+1/2003)(1/2+1/3+···+1/2004)

(1/2+1/3···+1/2003)(1+1/2+1/3+···+1/2004)-(1+1/2+1/3+···+1/2003)(1/2+1/3+···+1/2004)
(1/2+1/3···+1/2003)(1+1/2+1/3+···+1/2004)-(1+1/2+1/3+···+1/2003)(1/2+1/3+···+1/2004)

(1/2+1/3···+1/2003)(1+1/2+1/3+···+1/2004)-(1+1/2+1/3+···+1/2003)(1/2+1/3+···+1/2004)
设x=1/2+1/3+···1/2004
y=1/2+1/3+···+1/2003
(1/2+1/3+···1/2004)(1+1/2+1/3+···+1/2003)-(1+1/2+1/3+···+1/2004)(1/2+1/3+```+1/2003)
=x(1+y)-(1+x)y
=x+xy-y-xy
=x-y
=1/2004

趋近于1

(1+1/2+1/3+···+1/2003)(1/2+1/3+···+1/2004)-(1+1/2+1/3+···+1/2004)(1/2+1/3+···+1/2003) (1/2+1/3···+1/2003)(1+1/2+1/3+···+1/2004)-(1+1/2+1/3+···+1/2003)(1/2+1/3+···+1/2004) 2003/1+2003/2+2103/3+······+2003/4005 急·····················1+2+3+...+999=? 1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········? 1+2++3+··········+10000= 8+11+14+17+20+·······+305 数学计算题.呜呜呜1+2+3+4+···················+98+99+100+99+98+···············+3+2+1 2008+2007-2006-2005+2004+2003-2002-2001+······+4+3-2-1= 谢 已知1,-2,3,-4······,2003,-2004,2005,则这2005个数的和是多少. 1/1*2+1/2+3+···1/2002*2003+1/2003*2004+1/2004*2005 秦始皇和汉武帝各自的功劳是?(用1·······2·······3··········来说) 证明1·3·5·····(2n-1)/2·4·6·····2n 已知三个角1,2,3满足:1与2互补,2与3互余,试求1-3的大小!································· 变态数学题·······方程一道············x+2y+3z=1x=y+12x+3y+5z=2方程组············要过程············我解了之后总觉得无解····· 有理数加减运算(-1)+(+2)+(-3)+(+4)+·····(-2001)+(2002)+(2003)+(2004)怎么解 1/3+2/3=1,但0.333···+0.666···=0.999···,为神马?额······谁能解释一下······ 1+3+5+7+``````+(2n-1)+(2n+1)+(2n+3)和103+105+107+······+2003+2005 数列 1/2,3/2,1/3 ,4/3,·········1/n+1,n+2/n+1,·········是否有极限?