5000-1-2-3-······-76-77-78=?

5000-1-2-3-······-76-77-78=? 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+1 500-1-2-3-········-76-77-78.怎么算?要巧算. 秦始皇和汉武帝各自的功劳是?（用1·······2·······3··········来说） 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····· 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 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, 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!································· 2[4/3y—（2/3y—1/2）]=3/4y急·································!1 1/3+2/3=1,但0.333···+0.666···=0.999···,为神马?额······谁能解释一下······ 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························································· 将下列每个3*3正方形内的九格以及横竖九格均填入一至九的数字,且不重复.· 8 9 · 2 ··1··· 1 ··· 3······· 6 7········· 8 2·········5 ···· 7 ··············· 9 8 ····7 · 证明1·3·5·····(2n-1)/2·4·6·····2n 贡献和呼吁的造句?急急急急急都写三个，1、贡献····· 2、··· 3、······ 1、呼吁····· 2、······ 3、······· 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··························