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设函数f(x)在(-∞,+∞)上可导,且a,b是f(x)=0的两个实根.证明:方程f(x)+f'(x)=0在(a,b)内至少有一个实根. b.c错哪儿d又为什么对,不甚感激. 求高等数学的综合题解题过程 求高等数学的综合题的解题过程.求详细解题过程,不急不急.坐等最佳答案.谢谢大家帮帮忙. 人们常用一些动物的名称来比喻某种特殊的人,如：“变色龙”比喻见风使陀的人填写：1.用“ ”比喻代人受过的人2.用“ ”比喻面善心狠的人3.用“ ”比喻随声附和的人4用“ ”比喻非常孤 每个括号里的算一排,不作为标点,每排都有错,请指出并改正,有一排无错误(I have read your advertisement in the newrpaper)(yesterday and I'm writing to tell you what I'd like to)( work as the volunteer for the 2008 Beijing Oly 四边形ABCD中,角B=90度,AB=3倍根号2,BC=根号7,CD=12,DA=13,求C点到AD的距离 英语改错,would you like having a cup of tea.Don't running in the corridor.Where is Tom?He's playing the badminton.Mysister doesn't like drawing and painting.我给你们十分，投票中不中就看你们了. 甲、已俩车同时从A、b俩地相向而行,相遇后继续前进,当甲车行了全程的80%,乙车行了全程的60%,这时俩车相距 甲已俩车同时从A、b俩地相向而行,相遇后继续前进,当甲车行了全程的80%,乙车行了全程的60%,这时俩车相距离 甲乙两车分别从A,B两地开出,相遇后继续走,这时两车相距96千米,甲车行了80%,乙车行了60%,求全程 成熟西瓜中的甜汁液来自细胞液还是液泡? 吃西瓜时流出来的西瓜汁是不是西瓜的液泡? 求解英语改错题,this is a story tell by my father:when i was boy ,the most exciting thing was when to celebrate the spring festival,my grandma was the best cooker in the world but could make the most delicious dishes.one time i just couldntwait 英语改错题求解1.Where is Gary?He may in the library.I am not sure.2.He can not has finished the work so soon.3.I have to stay at home yesterday.I was ill.4.Where have they gone?They may have went to Egypt on holiday.5.Need i look the door when 几到英语改错题!1：I have a Art lesson in the afternoon.____________________________________2:Li Li is third of her parents._____________________________3:The hot coffee near thr clock is of the doctor._________________________________________ 几题英语改错题,I like a apple for dinner.Jim and his father doesn't like fruit.Miss Gao have eggs and milk for breakfast.The reporter ask us for our eating habits.Let's have some bread and milk for the breakfast. 种植芹菜后用什么除草剂能除去双子叶杂草 大棚芹菜除草剂需要用什么?我们这许多农户种植芹菜,我身为一个农技员也不知道芹菜地除草剂到底用什么.也帮助我们的农民兄弟! 能不能帮忙分析下这个升压电路的原理? 简述一下图电路的升压原理；芯片 资料我查了 但是看不懂啊 全英文 找了个英语专业的帮着翻译了下 大致就是这样的 LM2577-ADJ 开关电源芯片被整体整合在集成电路中,为反激变换开关调节 急求答几个英语改错题1.He told us he had joined the party in 2000.2.i would have gone to Shanghai yesterday,but i had missed the flight. 如何答英语改错题 Does the children likes the ball? 汽车每小时72千米开,驾驶员按一声喇叭,4秒后听到回音,听到回音时汽车离山谷?米（声音速度为每秒340米80是什么? 三极管UE= -3V .UCE=6V,UBC=-5.4V问该管是NPN还是PNP,处于何种工作状态?为什么?这个问题百度知道上有过答案,但我想知道为什么不是PNP管处于截止状态,请解释清楚,U3=-3v UCE=VC-VE可求得 VC=3V UBC=VB-VC=-5. 如何用万用表来判断三极管是PNP 型还是NPN型 为什么西瓜的汁液来自液泡而不是细胞质 细胞质里不是也有细胞液吗? 关于爱情的唯美句子,列如“除非黄土白骨,我守你百岁无忧”这样的古风较浓的句子. 要高一必修一、二生物全集课件 最好还有数学第一二章的,物理一二章的 化学第一章的. 内质网中有下列哪些物质 A DNA B RNA C 糖类 D蛋白质和脂类