“1+2-3-4+5+6-······+105+106”的结果是多少?
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证明1·3·5·····(2n-1)/2·4·6·····2n
观察下列三角形数表其中从第二行起每行的每一个数为其肩膀上两树之和则该表的最后一个数是?1 2 3 4 5 6 7 8················ 97 98 99 100 3 5 7··························
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2011红领巾快乐数独答案一2·····4·9·631·4·8·8··97··3··3··2·95···95·86···15·3··7··9··47··5·7·3·182·3·4·····7二7·1·8·3·····413·6·2·6···4·8·8·5·1·2·61·····94·2·9·4·7·8·
序列 1 2 3 4 5 6 ······ n 对应的数 1 3 6 10 21······?
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
把1 9填入81格方框,不能重复· · 4 · · 5 · 6 ·9 · · 3 · · · 5 17 · · 6 · · · · 3· · 9 · 1 6 · 4 ·· 2 · 4 · · · 8 ·· 4 · 7 · · 5 · ·5 · · · · 7 · · 84 1 · · · 8 · · 5· 8 · 9 · · 6 · 4
(2+4+6+8+······+100)—(1+3+5+7+······+99)等于几
(1+3+5++7+9······+2011)-(2+4+6+8······+2012)=
(1+3+5+······2013)—(2+4+6······+2014)用简便方法哦,这是奥数题.
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 ···· ····· ··························
计算1-2+3-4+5-6+······+99-100=
计算:(2+4+6+8+···+100)-(1+3+5+···+99)
1+2+3+4+5+6······38+39=?
计算1-2+3-4+5-6+······-98+99=
1+2+3+4+5+6· · · · · ·+2013等于多少