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

adapt,adopt ,adept 三个词的意思?翻译! I want to know why you didn't do as told.为什么不是do as told to?不是有do as I tell you to?如果as换成what, 硅和水生成什么?回答得出算你厉害!哈哈哈哈哈哈哈哈看谁比较厉害! 硅能溶于水么 或者能跟水反应么?生成什么? for+me+to+adapt后面要加to吗? what ( )do you get on your birthday补全单词 job offer是什么?是公司主动提供的还是只要录取公司的通知信都叫 job offer我的意思是指公司对你的邀请函不要求你面试只问你是否同意还是说自己联系公司面试和公司邀请都算作job offer what do you do(on) your birthday为什么要用on 请问硅和水生成什么? ——Hi ,henry ,How's it going with you ——___D__A.it's pretty B.it's snowing C.it's warm and cloudy D.not bad 我觉得其实A也可以选啊,为什么不能呢, 偏硅酸钠和水加热后加乙酸钠生成什么 adapt to中的to 为什么? You can have a sweater at good price.(改错） The koala is kind of ugly,（ ）very cute.A.but B.or C.as well D.as well as Would you please______（advise）me how to improve my spoken English? can I give you a hand?的答语是什么肯定的和否定的 We would suggest the following.Please advise your comment 寻求英语模仿对象要有一口标准的英腔,最好是国外的播音员什么的.P.S.国内的不行 想练习英音,请大家给我推荐几个可以模仿的对象吧! 英语怎么说? It is because of the darkness of night,to show the bright Miss Green n_____ to talk to Jack because he fails the test.xiexie will always be by your will always be by your site的中文意思. must be i miss you 翻译成中文谢谢 i must be cull you must be i miss 翻译成中文谢谢 请问news发音“努斯”是美音还是英音? AP NEWS minute 是英音还是美音VOA是美音,BBC是英音,那么AP NEW MINUTE是什么 怎么听区别啊.CNN呢？ i can fell a hot one my brother()some money from my neighbour()()()()() you mind my borrowing some money from you同义句would you mind 后面有四空怎么填啊,总觉得四空太少,可可可题目就只有四空啊! you must be 意思you must be...you must be one上文好像是要某人去做一件事。