（9999+9997+···+9001）—（1+3+5+····+999）=?

（9999+9997+···+9001）—（1+3+5+····+999）=? （9999+9997+.+9001）-（1+3+.+999） （9999+9997+.+9001）-（1+3+.+999= 1+2+3+4+5+······+9999=（ ） 急用 (9999+9997+.+9001)-(1+3+.+999)=? 根号下9999····9乘以9999···999+199999··99（都是N个9）结果是多少? （9999+9997+…+9001）-（1+3+…999）简算等于多少写出过程. 计算1/（1*4）+1/（4*7）+1/（7*10)+------+1/(97*100)································································································ 5555·····55（20个）（ ）9999········999（20个）能被7整除,括号中的数字是多少?是41位数！ 数学题9+99+999+9999+······+9999·9999(2000个9) 关联词 就算······（ ）······ 写一篇作文,题目是《这样做,值得》 要求：600字以上,文体不限（诗歌,戏剧除外）快···························································· 用“郑重其事”（造句）急···························································· (9999+9997+...+9001)-(1+3+...+999)怎么计算? 我最好的朋友（作文）不少于500字急!···························· 赏析春雪（韩愈）三、四句要“精确” 不要复制一大片 急···························· 9999+7778+3333+6666的简便计算快·········急需 英语造句 每个5句 There is ·······on········street 造五个There is the ·················（方位介词）the···········造五个