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分析：设f（x）=lnx-kx-1,将方程kx+1=lnx有解问题转化为函数f（x）有零点问题,进而利用导数研究函数f（x）的单调性和极值,找到使函数有零点的k的范围设f（x）=lnx-kx-1则f′（x）=1- kx/x.,（x＞0） 已知：正比例函数y=f(x)满足f(3)=-5,试比较f(-根号3)与f(-根号2)的大小 1.方程lnx-x=0的根的个数______________ 2.方程lnx-x=a有两个实根,则a的取值范围_________3.任意x∈(0,2),不等式f(x)≤k恒成立,则实数k的取值范围________4.存在任意x0∈（0,2）,使得不等式f(x)≥k能成立,则实 判断方程f(x)=lnx-（2/x）的实数解的个数判断方程f(x)=lnX-（2/X）的实数解的个数判断方程f(x)=lnx-（2/x）=0的实数解的个数 设函数y=f（x）是定义在正实数集上的减函数,并且满足f（xy)=f(x)+f(y),f(1/3)=1,(1):求f(1)的值第二问、如果f(X)+f（2-x) 怎样选择英语阅读方面的书我想找一些英语阅读方面的书做一下,提高自己的阅读翻译水平,但不知道怎样选择,我本身就是刚过四级的水平,平时在阅读方面一遇到长难句能分析,就是翻译不明 我的英语阅读不是很好,想找一些英语阅读的书来做,要选哪些呀 英语阅读的重要性及怎样选择合适的课外书 选择正确选项!15Do you have_______ friends in Shanghai?many any not 16I don't need _______mineral water,but I'd like ________tea,thanks.some,any any,any any,some 17Have you got _______ lychees?some any / 18I'd like _______ apples,please.some any 英语 选择一个合适的选项--Where's Tom?--Oh,Mary's gone swimming and( )A.so is Tom B.so Tom is C.so Tom has D.so has TomJohn began to learn Japanese by himself in ( )A.ehe sixty B.the sixties C.his sixty D.his sixties 给一个大概标题, 八年级上册人教版数学学习之友57页答案 求方程x+|lnx|=2实数根的个数 现在已知一个函数f（x）=lnx+x2－4x 求方程f（x）+x2=0在（1,+∞）上的根的个数现在已知一个函数f（x）=lnx+x2－4x求方程f（x）+x2=0在（1,+∞）上的根的个数 f(x)是定义在R上的奇函数,x>0是,f(x)=x+lnx,求方程f(x)=0时的实根个数选择题,给个答案就行 急啊``````````````今晚就要 快乐练习100分六年级上册数学29页第三题、规范填表.题目： 比：前项 比号 后项 比值 除法（ ） （ ）（ ）（ ）分数（ ）（ ） （ ）（　）　　　急急急急急急急！ 一个表格————————-——————————————————|____________| 进价（元）|售价（元）|赚 （%）|赔（%0||羊毛衫（甲）| 200 | 260 | |（无）|————————-——————— 求解一道英语详解,为什么选该选项All the dishes in this menu,____ otherwise stated ,will serve two to three people.A.as B.if C.though D.unless 已知函数f(x)=x^3+ax^2+bx+c在x=-2/3与x=1处都取得极值,若对x∈[-1,2]都有f（x）＜1/c恒成立 求c范围 初二英语选择,求选项详细解释和句子翻译1、sundy didn't read the fiction .I didn't read it,___ . A,too B,also C,eight D,stopped 2、There must be a river near here l hear the ____ of running water. A,sound B ,prediction C,freed 初一上册数学课课练P82-84的答案 x=4/25x的平方-1/25 x为几x为几 用文字表示 不然我看不懂 x=4/25x的平方-1/25 已知函数f(x)=x^3+ax^2+bx+c在x=-3/2与x=1时都取的极值,求a,b及f(x)单调区间 已知函数f(x)=x^3-ax^2-bx+c在x=-2/3与x=1时都取得极值求a,b的值及函数f(x)的单调区间;求a,b的值及函数f(x)的单调区间;若对x属于[-1,2),不等式f(x) 已知函数f(x)=x^2+ax^2+bx+c(x∈[-1,2]),且函数f(x)在x=1和x=-2/3处都取得极值.（1）求a.b的值（2）函数f(x)的单调区间 已知函数f(x)=x^3-ax^2+bx+c(a,b,c∈R)(1)若函数f(x)在x=-1和x=3时取得极值,当x∈[-2,6]时,f(x)f(x)的x取值范围 英语翻译May god grant you a good evening,you who’s love has owned me.You are more precious than my life,What would my life be without you.I embrace you with love,and find my place in your eyes.happiness overwhelms me when i'm with you,and I que 英语翻译May God grant you a good evening,you who’s love has owned me.You are more precious than my life,What would my life be without you.I embrace you with love,and find my place in your eyes.happiness overwhelms me when i'm with you,and I que 英语翻译Before the goodbye come herecome closer and hug mestay in my arms for a while and try to rememberfor how many years you and mehave been together and you loved me?Stay with me in my arms and try to rememberwho told you that I no longer wan 定义在实数集R上的奇函数f(x),当x＜0时,f(x)=x^2-x,则f(x)的解析式为? 求纯手工译中文加分,英语翻译,求大神高手,杜绝渣翻机译,感谢无比so now she's talkingand the times of silence are overshe grew up and learned (experienced)and now she has a voiceshe was good, she was kindbut turns out she's a b