1*2+2*3+3*4+···+10*11求写过程、急!
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序列 1 2 3 4 5 6 ······ n 对应的数 1 3 6 10 21······?
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
带有数字的四字词语按顺序1···2···3···4···5···6···7···8···9···10···祝福语
证明1·3·5·····(2n-1)/2·4·6·····2n
急·····················1+2+3+...+999=?
2[4/3y—(2/3y—1/2)]=3/4y急·································!1
这几道奥数题谁会,求2014在哪一行那一列 1 2 3 4 5 10 9 8 7 6 11 12 13 14 15 20 19 18 17 16 求2014哪一行那一列 1 2 3 4 5 6 7 8 9 ···· ····· ··························
数列 1/2,3/2,1/3 ,4/3,·········1/n+1,n+2/n+1,·········是否有极限?
1+2+3+4+5····+50
1+2++3+··········+10000=
俗语和名句的填空1······,自知之明.2······,行必果.3工欲善其事,······.4临渊羡鱼,······.5非学无以广才,······.6······,福兮祸之所伏.7项庄舞剑,······.8······,人以群
1+2+3+4·······+98+99等于多少
正整数按图的规律排列,请写出第二十行,第二十一列的数 列 行 1 2 5 10 17 4 3 61118 9 8 7 12 19 急列 1 2 3 4 5行 1 2 5 10 17······················ 4 3 6 11 18······················9
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(1-2)×(2-3)×(3-4)×······×(19-20)=
1+2+3+···+2008?2+3+4+···+2009