为什么用have dinner

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• 已知数列｛an}的通项公式为an=(n+2)*(9/10)^n,试问n取何值时,an取最大值?试求出最大值.为什么用an/a（n-1）,算的是当n=7时有最大值;而用a（n+1）/an,算的是当n=8时有最大值.算的方法如下：（是不是方法错啦?）an=(n+2)*(9/10)^n a(n+1)=(n+3)*(9/10)^(n+1) a(n+1)/an=[(n+3)*(9/10)^(n+1)]/[(n+2)*(9/10)^n] =9(n+3)/[10(n+2)] 当a(n+1)/an≥1时,说明an是递增数列 即9(n+3)/[10(n+2)]≥1 解得n≤7,即an在n≤7时是递增的,在n>7时是递减的 所以an在n=7时an最大a7=9*(9/10)^7=9^8/10^7
• 英语：be away from get back to sp come back to sp return to sp by the lake leave sp leave for sp leave sth at/in I have a toothache（该同义句） -------------------------------------------------- How many teachers are there in your school?About two __________________________数学：小明在公路上行走 速度是每小时6km 一辆车身长20m的汽车从背后驶来 并从小明身旁驶过 驶过小明身旁的时间为1.5s 则汽车的速度是?（写出过程及说明道理）
• ( )2.— I feel kind of now.— Why not eat out with us?A.large B.hungry C.heavy D.fat( )3.There are so many between Chinese and English.A.pictures B.museums C.children D.differences ( )4.— John,you’re late again.Do you have anything to say for — No.I am so sorry.A.my B.mine C.yourself D.yours( )5.The weather was fine,we went out for a walk after dinner.A.or B.but C.if D.soShe tuened off the light and then( ) A.leaves B.left C.leave D.leaving
• 三道高中水平的英语问题第一问：the sharks have attacked a number of people 【off】 the beach of America,some of them a re seriously injured.我想请问这里的off是什么用法?是不是输入错误了?如果说是attack .off,那么后面的作为地点,应该充当地点状语,但是名词不可能直接充当状语.如果说这个off和后面的名词搭配作介词,构成地点状语的,那么请问这个off应该怎么理解呢?=第二问：they started off late and got to the airport with minutes to （spare/leave）答案是spare,因为网上说spare有剩余,多出的意思.但leave不是也有剩余,剩下的意思吗?为什么不能用呢?=第三问：Unlikey,they had a 【flat tire】 on the way back.flat和tire各自是什么意思?它们在此处各自的意
• ···is this passage probably taken from?中为什么用taken这过去分词,不是没have么?Which section of a newspaper is this passage probably taken from?中为什么用taken这过去分词,不是没have么?
• 英语翻译that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion.take可翻译为“获得”或者“感到”或者“承担”,devontion可翻译为“热爱”或者“献身”,名词.那是不是英翻译成：从这些光荣的死者身上我们获得了对*事业的更大的热诚,因为他们为此献出了自己宝贵的生命.我感觉这样还顺耳一点.百度上的两种翻译总是让我感觉有点怪怪的,百度百科：自光荣的亡者之处吾人肩起其终极之奉献.表面看没什么,但是take increased devotion好像没翻译出来.另一个版本：我们要从这些光荣的死者身上汲取更多的献身精神,来完成他们已经完全彻底为之献身的事业.这个还行,但我觉得devotion不能作“献身精神”,因为很少看到别的句子有这个意思,难道还有You have a lot of devotion（你很有献身
• 用所给词的适当形式填空　　1.Tom ______ (be) ill last week,he ______ (be) much better now.　　2.Jimmy and his sister _______ (be) here several days ago.They ________ (leave) for Beijing yesterday.　　3.He ___________ (have ) a bath when the telephone ________(ring).　　4.While I __________ (cook ) the dinner,he ___________(read) the paper.　　5.He arrived just as I _____________ (answer) the phone.　　6.After I heard the news,I ___________ (hurry) to see him.　　7.We _________
• 万有引力的物理题地球赤道上放置的物体,随地球自转的线速度为v1,近地卫星绕地球自转的线速度为v2..求v1：v2=我的问题是..为什么用万有引力等于mv^2/r..就是错的
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• the company had about 20 notbook computers but only one- third __were______ used regularly.Now wethe company had about 20 notbook computers but only one- third __were______ used regularly.Now we have 60working all day long.为什么用过去时,不是regularly经常吗,我觉得应该是现在是
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