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导数-高中导数计算已知f（x）在R上可导,且f（x）=x^2+2x*f'(2),则,试比较f（-1）与f（1）的大小. 求sin x/2 乘以 cos x/2 的导数,我是这样解的：sin x/2 乘以 sin x/2 减去 （cos x/2 乘以 cos x/2)= -cos x,即利用导数的乘法原理.可是正确答案是把原式化成了1/2 sin x,然后求它的导数,请问我的解法有什 如何得出f'x=-2圈出来的部分 化简x+1+x分之1/x的平方-x分之1 spend three week she in read the book用所给词组成正确的句子 一道英语选择题：Mrs Green has three daughters,______she loves them very much.A.but B.for C.and D.with要说明原因哦！ She ___ her English book,so she has to buy a new book.She ___ her English book,so she has to buy a new book.A .loses B.lost C.has lost D.will lost 经过点（5,1 ）的反比例函数y=x除以k（k不等于0）的图像,求x大于或等于1时 y的取值范围 和Y大于-2,x的取值求解题方法. 反比例函数y=k/x(k不等于0)的图像经过(a,-a),那么k的取值范围是 越多越好,要纯练计算的,谢 高中导数运算选择题,求答案 Alice has gone to England for a__________English course.A.six month B.six mo选什么,涉及什么语法, ( )My English teacher ______ England twice.A.has been to B.has gone to 英文歌曲she's gone伴奏哪有 急 She is goneShe is goneShe was goneShe has gone区别?不是问时态 懂的回答 高中时期所有导数公式 Before she came to england she had never heard a single english wordA:speaking B:spoken C:to speak D:speak 英语在线翻译Alice had nothing to do then,did she? she came to england from india. She is from England.She can 1( )2( )English1( )里能填speak,say,talk,tell2( )里能填good,poor,bad,well 2013年太阳风暴到来时.人类会有灾难性的灭亡吗?今天看百度视频主页上说某些国家经过多年多太阳的观察.预测2013年会有太阳风暴.那时各种通讯设备网络以及电源都会崩溃.总之希望我们人类 2012年的太阳风暴真能使人类文明大幅度倒退吗?如果考虑到人类情感的脆弱和文明秩序的 破 坏 ,人类社会甚至有可能由于太阳风暴而 灭 WANG y=k/(z+x)是不是反比例函数（Z不等于零） 反比例函数中为什么k不能等于0? 反比例函数y=k/x中k为什么不等于零大神们帮帮忙 Lao She taught the English Chinese in London in 1926.（改为同义句）Lao She taught ____ ____the English Chinese in London in 1926. 小华家的方桌的边长是80厘米,把它四边撑开,就成了一个圆桌面.求这个圆桌面的面积 model：Lao She taught the English Chinese.——Lao She taught Chinese to the EnglishMy uncle gave me a very nice present on my thirteenth birthday.——Tony,can you pass me that pencil?——My brother bought me some storybooks last week—— 小华家的方桌的边长是80厘米,把它的四边撑开,就成了一张圆桌面（如图4）.求这个圆桌面的面积.不要太难的解答,让我看得懂就行,五年级水平 he taught Chinese to English in London怎么译 小华家的方桌的边长是80厘米,把它的四边撑开,就成了一张圆桌面,求这个圆桌面的面积. To learn English,she went to school in London.改同义句添入She weng to school in London____ _____ _____learn Engilsh(一空一词)