雪花晶体的形状

求f（x）=e^（2x-1)导数.不急,对了才好. f(x,2x)=x,f(x,2x)的关于x的一阶偏导数等于x^2,关于x的二阶偏导数等于关于y的二阶偏导数,求f（x,2x）关于x的二阶偏导数. 一个等腰直角三角形,其中一条直角边是6cm,它的面积是多少?如果这个三角形的底是18cm,它对应高是? she felt very r_________ listening to music (去…的路上)her grandma's,she felt very happy.将括号内译成英文 we don't often go to the library 为什么用don't? We often go to the library_the information.填什么?为什么? 如果lxl=lyl,那么x与y的关系是 一个等腰直角三角形中,它的斜边长 6cm,这个三角形的面积是,斜边上的高是 20-3x=13/15 i often read some n____ to know the news根据首字母完成填空 I have never read this novel.how about you?A.So have I.B.Yeah,me too.C.Neither did I.D.Me neither. that was eight years ago .为什么开头要写that,可以写it was eight years 亲. that was eight years ago是主语从句吗? That was thirty-eight years ago when I was fifteen 是什么状语从句还是定语从句,为什么 "it was many years ago that I met him"其中的 ago 为什么必须有呢? I ofte read books 的同义句是什么啊?星期1要交.急 thirty people away 怎么翻译? 100-4（8-3x)=200 介意的近义词是什么 介意 近义词 若M,N属于{1,2,3,4},点P的坐标为(m,n),则p在直线x＋y=5上的概率为? 被一道解方程难住了,100-4（8-3X）=200你们都好牛啊！我……自愧不如啊！那木，既然如此的话再帮我解几提吧！1、19X-5（3X-4)=24 2、2(4X-3)+(15-2X)=24+12 那位大神最先解出来就赏分~ 介意的近义词 捉摸的近义词 若以连续两次骰子分别得到的点数m,n作为点p的横,纵坐标,则点p在直线x+y=5上的概率为 the most recently 和 the next most recently 哪个离当前的时间最近?一时间分不清楚哪个离目前的时间近了,对做题有影响!谢谢各位! most recently啥意思 it is three years since we____(most recently) met each other at david's part When _____ what really changed his life eight years ago,he tells us that the most imoprtant thingwas confidence.A to ask B to be asked C asking D asked 高一英语完形填空:several years ago,while attending a communication course,i experienced a most unusseveral years ago,while attending a communication course,i experienced a most unusual process. 大学英语第三册 词汇（在线等）100分大学英语第三册词汇.急. 已知函数f（x）=绝对值2x-1 a＜b＜c 且f（a）＞f（c）＞f（b）则 A.a＜0 b≥0 c＞0 B 2a+2c＜2选哪个 a c和x都是指数 读作 绝对值2的x次方减1 2的x次方减1是整个绝对值