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一道数学题求简便解决方法65.一项工程,甲一人做完需30天,甲、乙合作完成需18天,乙、丙合作完成需15天,甲、乙、丙三人共同完成该工程需：　　A.10天 B.12天 C.8天 D.9天求简单理解运算方法,通 This solution could not be downloaded ------------------------------------------打开电脑出现这个This solution could not be downloaded--------------------------------------------------------------------------------Most likely causes:Your compu M. I was on the call-in show last Saturday.W: What was that?M: People meet on the air and chat, and the host plays match-maker.什么意思 he boughrt a new pen to school_______.选项是A.torrmorow B. next day C.the next day D.the day选出选项并注明,并注明原因!本人急用,麻烦各位了!谢谢!题打错了，把bought中的r去掉！ 求一篇挑战自我共创美好未来作文800字+ he writes( )a nine pen sometimes I see a film with my mum sometimes划线提问 写出四句话,其中三句用动词play,一句用名词play (1/4)翻译 during a recent interview with Mary Eisenhower,the granddaughter 将这3个句子改为被动语句1.we have not solved the problem yet2.the company has given its computers away to alocal school3.the scientists have developed a kind of intelligent robot 英语翻译Little Jim should love to be taken to the theatre this evening. 勾股定理的, ..(挺难的)高手进周末某班组织登山活动,同学们分甲,乙两组从山脚下沿着一条道路同时向山顶进发,设甲乙两组行进同一段路程所用的时间之比为2:3.(1)直接写出甲乙两组行进速度之比.(2)当甲 He interests are in social, environmental and political issues 请问这句话语法错误在哪? 怒而触不周之山的触 let’s put on our thinking caps and get started,里面的thinking caps 什么意思 怒而触不周之山的而字 Let's w------ with a penW后面是什么词? 怒而触不周之山的“而” 怒而触不周之山的之 4月21日很多朋友发不少个8 当说说 我国将每年的4月25日定为 全国儿童预防接种日 ,这有什么意义?我国将每年的4月25日 元代大都是指哪个城市 英语翻译Unfortunately,we do not have sufficient credit information to offer you open account terms at this time.Would it be acceptable to ship this order cash on delivery?If you wish to receive open account terms for your next order,please provid Have we issued a stop work order.这句话为什么把have提前? 某物体以30m/s的初速度竖直上抛,不计空气阻力,g取10m/s^2.5m内物体的（　）.A路程为65m　B位移大小为25m,方向向上　C速度改变量的大小为10m/s　D平均速度大小为13m/s,方向向上　　　　要求要有 我只是想不通为什么T1和T2会不一样?轻质绳的张力不是处处相等吗? 元旦联欢会贺词 汉译英：他做饭做得很好 中译英（美国人做菜通常用准确的量来衡量）美国人做菜通常用确切的量来衡量,而中国人做菜通常凭感觉.大致意思翻译出来就行 有没有一些关于六年级上册苏教版的数学题, 三乙氨对人有什么伤害