齿轮分度圆必大于根圆

已知2f(1/x)+f(x)=x (x不等于0)求f(x)用1/x替代x这一步能讲得详细些么? 设f(x)是定义在R上的函数,对一切x∈R均有f(x)+f(x+2)=0.当-1 What do you do in English classes?怎么回答啊? 求一些高一数学求函数解析式的题如“已知f[f（x）]=2x-1,求一次函数f（x）的解析式”之类的.我是想再找些来练 高一数学求函数解析式已知f（1-2x）=x平方分之（1-x平方）,求f（x）解析式 药剂学计算：1g氢溴酸后马托品的氯化钠等渗当量为0.17g,问：4％氢溴酸后马托品溶液是等渗、高渗、低渗?药剂学计算：1g氢溴酸后马托品的氯化钠等渗当量为0.17g,问：4％氢溴酸后马托品溶液 药剂学计算题,今天上午前有急用,哪个是3g蒙脱石散（3g/袋）,抽取10袋精密称定结果如下：3.105 2.944 3.207 3.054 3,2263.178 2.835 3.190 2.891 2.998判断该批蒙脱石散装量差异是否合格? 求新目标七年级上的单词表,按单元的.一定要按单元打啊,不要Excel的,就用WORD打,左边英文,右边中文在下午5.00前回答追加50分!整本书都要啊，测试单元的可以不要禁止按a b c1楼的不行 求新目标七年级下册英语单词表 英语翻译"不是所有牛奶都叫特仑苏"这句话用英语怎么翻译, 英语翻译你学得越多你就懂得越多,当你达到某一种境界时,你便拥有了权利. 数学填空题,三角形 英语的所有语法 英语所有语法.就是 help to do sth.这种形式是语法吧？希望多写点这种形式的， 语法过关：It's a quilt on English. 氯化钠溶液的配置要配置100g 10％的氯化钠溶液,现有50g 20%的氯化钠溶液、80g 5%的氯化钠溶液、足量的水和足量的氯化钠,要求写出4种配置方案. 求高人将下面的句子翻译成英文 谢谢~你们给我汇钱的那个银行要求我退汇,因为他们说什么资料填写错误,不能证明我的身份,希望我把钱退给他们 他们核实了以后再汇给我.但是我已经收到了 英语翻译Neither party makes any misrepresentation with respect to and does't warrant the accuracy of any information or any document during the negotiation or entering a contract with third-party shall solely responsible for consequences in any a Being exposed to sunlight for too much time will do harm to one's skinA.Exposed B.Having exposed C.Being exposed D.After being exposed 为什么ABD不行 求新目标7年纪英语下册所有单词 1、( ) to sunlight for too much time will do harm to one's skin.A Exposed B Being exposedC Having exposed D After being exposed 2、A middle-aged woman came ( )to the bus stop only( ) the bus had gone.A run;to find B running;to find C and ran;found ___ to sunlight for too much time will do harm to one's skin.为什么不能用Exposed?不可以看成是be exposed to 放在句首省略be吗?就像Lost in thought ,he didn't notice me come in. Being exposed to sunlight for too much time will do harm to one"s skin 和Settled in a friendly way,搞不清楚原因啊 英语填空（初中的单词）1.F___ pets is my favourite.2.I hope e____ goes well.3.C____ the bridge,and you'll find the hospital on your left.4.A____ come from Australia. 1.(depart) He left for New York without telling anyone of us; so we all think his _______ was very sudden.2.(expose) Everyone would dread public_______ of all his faults.3.(hearten) It is said that many farmers were_________by the long drought last y [-C33] ____to sunlight for too much time will do harm to one’s skin.A.ExposedB.Having exposedC.Being exposedD.After exposed为什么选C不选A? 汤姆叔叔的小屋的读后感,好的加100分,今天回答加500分. 《汤姆叔叔的小屋》读后感（500字, ____to sunlight for too much time will do harm to one's skin.A.exposed B.having exposed C.being exposed D.after being exposed 我想问的是为什么不能选a.现在分词的被动形式与过去分词的被动形式到底有什么区别? 汤姆叔叔的小屋读后感500字(六年级水平) 第六次人口普查结果出来没有?中国目前的人口总数是多少呢? 正比例函数y=(2k-3)x的图像经过点(-2,-6),则K的值为