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

invite my friend __(help)me with my English. My friends Lisa can help me with _____(I) English i want to find friends who can spesk english.can you help me? 4.On weekends,she always________her cousin’s baby. 连词成句1the,goes,always,post office,by,bus,she,Sunday,on,to. 安全先进评选活动的英语如何表达 我经过激烈的选拔用英语怎么说我经过激烈的选拔并且胜出用英语怎么说 do you have翻译中文是什么意思 英语翻译In theory,a large amount of energy can be extracted from the reversible mixing of a dilute stream with the ammonia–carbon-dioxide solution .Using low-grade heat at 50 °C,the thermal energy needed to separate the diluted ammonia–carbo if you come to me歌名的中文翻译 谁能告诉我BLUE的《if you come back》的中文翻译? there （ ）a meeting tomorrow afternoon ​there （ ）a meeting tomorrow afternoonAwill be going to Bwill going to be C is going to be Dwill going to be答案是c为什么啊?我觉得a也行啊 There is going to be a class meeting tomorrow morning是对的吗 I want to make a friend with a foreigner that woking in shenzhen.I want to make a friend with him ,in order to practice my sporken English.Any way,I also can bring convenience for him. who can help me to make friend with the foreigner in Shanghai i want to make a friend with a foreigner!who be will not,she,does,a,collection,sports,have.连词成句 英语翻译调职、升降职：公司内部的人员调整,必需经过有关部门的负责人协商一致后,报总经理批核.部门经理认为其下属具备担任更高职位（或不具备现任职位）的能力及条件,可向总经理提 英语翻译需人工翻译 翻译得好加分 是给老外看的 不能出错啊```《专家规划论证办公室》筹建计划书一）目的和任务成立《专家规划论证办公室》的目的,主要是为“概念规划”作立项申请的 英语翻译By the Grace of God,To all whom the Presents shall come,Know ye that We of Our Especial Grace,certain knowledge and mere motion do by the Presents advance,create and prefer Our Juan Tenorio to the state,style,degree,dignity,title,and hono 早睡早起,英语翻译 把“首先,你应该早睡早起翻译成英语. I LOVE YOU TOO怎么翻译? I LOVE YOU TOO 求答 If you have a choice to earn simple interest on $10,000 for three years at 8.5% or annually compound interest at 8% for three years which one will pay more and by how much? HAVE A NICE DAY if you have a choice,______（buy）one large.答案给的buy 为什么我觉得是buying呢？ HAVE A NICE DAY这个是祝您今天过得愉快的意思,但用在书面上也是这样么.这个是不是比较口语化一点的.请高人赐教. 请问,have a nice day!这句话哪错了,请改一下是不是have的h要大写 HAVE A NICE DAY! What ----- your name and your phone number?is还是are And what is your candidate number?怎么回答