1/1+1/2+2/2+1/2······1/2012+2/2012+······2012/2012+······2/2012+1/2012=====

急·····················1+2+3+...+999=? 1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········? 1+2++3+··········+10000= 纸鹤数量的意义比如说 1只纸鹤,代表······· 2只纸鹤,代表······· ······················· ···························· ·················· 越多越好, 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 在等腰三角形ABC中,AB=AC.求证1、∠BAD=∠CAE 2、如果AD=AE,那么BD=CE吗?急啊························································· 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 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····· 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!································· 1+2···+99 因式分解 1^2+2^2+······+（n-1)^2+n^2 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 2[4/3y—（2/3y—1/2）]=3/4y急·································!1 -128,64,-32,16,-8,4,-2,1,-½,···第n个数是急需··················· 计算下面行列式,2 1 0 0······0 01 2 1 0······0 00 1 2 1 ·····0 0············0 0 0 0······2 10 0 0 0······1 按要求完成句子.要求：1）用“无论······还是·····无论······还是······”的句按要求完成句子.要求：1）用“无论······还是·····无论······还是······”的句式.2） 1/3+2/3=1,但0.333···+0.666···=0.999···,为神马?额······谁能解释一下······