已知x﹥0，y﹥0，x*x+y*y-xy=1，求x*x-y*y的最大值、最小值

He always _____（stay） at home when he is free. It is third time he______(participate) in the Olympic Games 尼采最经典的名言是什么 能否给几句尼采的名言? 尼采的名人名言德国哲学家尼采的名言“没有岩石的阻挡,哪能激起美丽的浪花?”有没有英文版的? 有没有具有哲理的小故事?用于即兴演讲有点幽默并发人深省! 人生格言、你们的人生格言是什么? 形容月亮的诗句都有什么 海德格尔的形而上学是一种什么样的形而上学?它同黑格尔的形而上学以及其他的形而上学有什么异同? 纳粹主义和尼采 叔本华 海德格尔 黑格尔哲学关系? 尼采和海德格尔的区别? 海德格尔的《尼采》这套书如何? Lin Hai,is the computer game in the school library ____? that,your,game,is,computer,the,in,library,school )连词成句 翻译 周末我什么事情也不想做 I don't want 根据汉语完成句子说每个句子考点是什么1.我不想骑自行车去那儿i don't want to go there( ）（ ）2.从我家到那儿开车要两个小时it （ ）two hours to ( )there from my home 我不想再在进入电影院前等很长一段时间.(翻译成英文) I don't want to _______before_______the cinema I don't think they could have gathered at the party last night,___?反意疑问句,填什么? 尼采的名言 要英文的 in,game,a,is,computer,library,the (.)(连词成句) 选择My parents__a teacher A.want me to B.want I to be C.want I be D.want me to beA.want me to B.want I to be C.want I be D.want me to be 英语翻译A nurse took the tired,anxious serviceman to the bedside.“Your son is here,” she said to the old man.She had to repeat the words several times before the patient’s eyes opened.Heavily sedated because of the pain of his heart attack, 英语翻译Today,let's talk sth about English.As we all know,there'are many ways which are used to learn English well.For example,wo can learn words by cards.Then,it is necessary for us to take note on our clsaa.Also,we need to review them after our 英语翻译The XALL?query returns the values of the mean,rel,jitterl,max,and min of the last completed measurement.These numbers are returned as one string with the individual numbers separatedby commas. 英语翻译1.人们喜欢发短信来取得联系而不是打电话（instead of）2.这种在温暖地区的蔬菜含有丰富的维生素,蛋白质和矿物质（用分词作定语的方法）3.好像George还没意识到平衡膳食的重要性(s 英文银行用语,1 先生,我们的美元兑换人民币的汇率是 千分之7.52 您是否需要将支票兑现成人民币?我的费用是 千分之7.5 BPS不是计算机的比特/秒的意思吗？ 求尼采的名言?求尼采的哲学与爱情名言,只要这两种啊,别的别发. 江苏省外语口语、口译等级证书和上i海市的口译证书,哪个比较有优势? What do I say when it's all 要准确的 When It'S Over 歌词 when will it be 英语翻译Terra dei Morti si innamorò di unbugiardo~Hoe slecht ik ben?Waarom kan ik zoeken naar een baan elke dag?哪国语言啊?