三组率样本量

x=-2,x+y+z=-2.8,求x平方【-y-z】-3.2x【z+y】的值 x的平方+2x(y+z)+(y+z)的平方因式分解 登岳阳楼以什么和什么点明了岳阳楼的时间以无限悲剧家抒发了诗人的情感 声音是由声带的什么产生的,它是由什么传入我们耳中 空间线性代数题.难空间直角坐标系中有A(0,2,0),B(6,1,2),C(8,9,1),D(2,5,6).求四面体A-BCD的体积,和四面体A-BCD各个面所成的二面角 It has a long body,It has a black heart,It walks on paper,It becomes shorter and shorter这是什么?（英语迷语） It has a long body.It has a black heart.It walks on paper.It becomes shorter and shor-ter.中文 It has a long body.It has a black heart.I t walk on pape r.It becomes shorter and shorter.what what is it 计算题：(-1+2x)(-1-2x) it has a long body.it hasa black heart.it bccomes shorter and shorter.what is it?啥意思啊 connectify dispatch是什么 订单中partial dispatch I would absoluty love to be your friend even a close one :) I like horrer movies best but comedy is cool too.I love music to rock,and screamo the best.What kind do you like? I think your English is alright its not that bad.帮我翻译一下 "滴水穿石”的近义词(3个) 英语翻译Parents owe their children firm guidance and consistent discipline.最后两个单词都不懂得,整句帮忙翻译, The western doctors’ diagnosis and treatment is/are consistent 用 is or are? 国家强大的成语 “一问摇头三不知”是形容一个人不知道的事情太多.现在有一道“三不知”的数学题.已知a,b,c是非零实数,并且其中至少有一个是负数．设A＝a/a的绝对值+b/b绝对值+c/c绝对值+ab/ab绝对值+ac/ac 什么是猫叫综合症 综合症与综合征有嘛区别?好像那一个都有啊. 通过产前诊断能够对哪项作出判断?A猫叫综合征,B先天性疾病 田馥甄渺小有什么含义 田馥甄的你就不要想起我的含义是什么? 110V400 HZ交流电压下,一个电容,一个灯泡,电容值C值和消费电流的关系 电压/（容抗+灯电阻）=电流,街上,灯的亮度 P=UI=I^2（容抗Z+灯电阻R）还是U^2/（容抗Z+灯电阻R）串联电路,交流电下功率怎么 She's had her lunch ,_______ she A.isn't B.hasn't C.hadn't D.doesn't 田馥甄寓意是什么 there___a lot of people in the park every morning.(have.has,is,are)there are many visitors____on bus 919.(sit,sits,sitting,to sit)D___should be more careful when they drive at night. 400vdc电容6000uf,充满电时,带一个100w普通照明灯泡的放电时间可以亮多少秒? 您与一个灵魂肮脏的小人来滥杀无辜,难道不怕天下人笑话吗?（改成陈述句）天下人会笑话你.怕天下人笑话.哪个对呢? der chef ist _dem projekt unzufrieden.unzufrieden 和什么介词连用啊sorgen _alle kinder 后用什么介词unfrieden auf bei uber mit sorgen fur um auf uber 常见无色气体有哪些 轩尼诗XO怎么兑的好喝求大神帮助我有一瓶XO