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1x2=1|3(1x2x3-0x1x2) 2x3=1|3(2x3x4-1x2x3) 3x4=1|3(3x4x5-2x3x4)由此推断1x2x3+2x3x4+3x4x5.7x8x9=? 1x2x3+2x3x4+3x4x5+...+7x8x9=, 1x2X3+2x3X4+3x4X5+…+7X8X9=? 1x2x3+2x3x4+3x4x5+...7x8x9的值是多少 请说出过程,亲们 用简单的方法ok？ （1/2x3x4）+（1/3x4x5）+.+（1/10x11x12） 1x2x3 2x3x4 3x4x5 .10x11x12,怎么算 1x2x3+2x3x4+3x4x5……+10x11x12巧算 请在两天之内回答 1/1x2x3+1/2x3x4+1/3x4x5+.1/98x99x100=要有中间过程 1/1x2x3+1/2x3x4+.+1/98x99x100 . 1/1x2x3与1/2x3x4、1/3x4x5、依此类推以至于1/20x21x22的总和是多少? 1/1x2x3+1/2x3x4+1/3x4x5+.+1/11x12x13= 1x2+2x3+3x4+...+n(n+1)=?1x2x3+2x3x4+3x4x5+...+n(n+1)(n+2)=? 1/1x2x3+1/2x3x4+1/3x4x5+.+1/n(n+1)(n+2) 1x2x3+2x3x4+3x4x5+.+n(n+1)(n+2)等于多少.1X2+2X3+3X4+....+n(n+1)=1/3Xn(n+1)(n+2) 1x2=(1/3)(1x2x3-0x1x2) 3x4=(1/3)(3x4x5-2x3x4) 问1x2x3+2x3x4+.+n(n+1)(n+2)=___________ 1/(1x2x3)+1/(2x3x4)+1/(3x4x5)+.1/(nx(n+1)x(n+2)=?请问这个题目该怎么思考,我经常碰到,可一碰到新的就无从下手.请高手教教我方法 零加零加二加五加二加零等于几 英语翻译当我和父母从报纸和电视上看到四川地震灾区的灾民们的有关报道后,我们都被震撼了,同时为他们的不幸感到同情,并和邻居们一起,纷纷捐款,尽自己的一点绵薄之力.我们为他们祈祷, 英语翻译Today we can enjoy music from far away,music of long ago,and music of here and now.We like to sing songs from other countries and of many years ago.We enjoy the old and new songs of our own country.We enjoy music composed by most of our t 英语翻译30All the differences compared by an analysis of variance for theaverage daily body weight gain were statistically significant. 30分高手英语翻译To the most reverend lord bishop of Soissons, Goslen, Suger by the patience of God abbot of St. Denis the areopagite, servant of God as best he can be, hoping to be united episcopally with the bishop of bishops. We ought to sub 英语翻译grinded and polished to minimize edges from nikasil flaking.these types of rework has to be confirmed with husqvarna[公司名] before shipping!per default,nikasil flaking is not allowed,not even reworked until allowance has been given. 英语翻译Disciplinary and capability Rules:The Employer’s Disciplinary and Capability Rules set out in Part2 will be applied in respect of your employment but do not form part of your contract of employment.12.Grievance Procedure:If you have any 英文中大于号,小于号,等于号怎么拼 三乘七等于二十一英语翻译 需要两种形式 英语翻译Will you _____ _____ _____ to go there? 英语翻译 英语翻译(1)£89.50(2) DM234.4s.3p (3)STG590.00 (4)￥868,000.00我的意思是用英语翻译过来，例如US＄100.00翻译成one hundred.dollrs,这样的翻译！ 英语翻译因为下大雨 所以路上长的很深的积水 车子不能走动 我门也很着急 您可以到立业路口看一下 水已涨到大腿 实在是出不去 请您谅解我门 等水退了以后 我们会立刻送过去 ..PS要最简 英语翻译 英语翻译Every year just after Christmas the January Sales start.All the shops reduce their prices and for two weeks,they are full of people looking for bargains.My husband and I do not normally go to the sales as we don’t like crowds and in any 英语翻译这两个词怎么选择比较好呢?contracted but remarkable好象意思偏差比较大吧....