三角形边长公式

圆的证明题（自己画图也能画出来）1.AB是圆O的直径,AD平分角BAC,角ABC=40度,求角ABD2.两圆相交于AB两点,过AB的直线分别交两圆于CDEF求证CE平行于BF3.AB为圆O的直径.玄CD与AB的延长线交与点E,AB=2DE, 东南亚各国城市的分布有何共同点? 东南亚的城市分布东南亚的大城市分布在大河沿岸地区的有利条件和弊端有哪些? 东南亚 的城市主要分布在哪里?是 东南沿海地区和河口三角洲地区吗? This in the house where iwas bornThis is the house where i was born.关系副词where可不可以改成关系代词that为什么?讲清楚点分析分析各成分 （ ）of the students in class 3 is going to take part in the Engish contestA.all B.both C.every one D.every为什么选C? （ ）of the students in our city are going to take part in an English cotest tomorrow（ ）of the students in our city are going to take part in an English cotest tomorrow.A.HundredB.Two hundredC.Two hundredsD.Hundreds It was this house where I was born.是主从还是定从?it做形式主语不是代替主语从句的么变成where i was born was this house但是又感觉像是定语从句,先行词是 house,where在从句里地点状语,像个关系副词引导 电角度是什么意思,交流电流为正弦量i=Sin(wt+初相角),这个公式理解 第3小题数学题 24题的第二小题还有25的第三小题尽量用初二内容把。证全等还有四边形的一些性质。写两大题的最后一小题就好了。 东南亚的大城市分布在什么地区 I took part in the b______ 100-metre race.这个空格填什么? -I heard Daming took part in the high jump yesterday -_____,and______.A.So he did；so did IB.so did he；so I did C.so he was；so was ID.so was he；so I was也要分析 正弦交流信号的三要素是哪三要素 second took race 100-metre the place in the pete连词成句 正弦量的三要素是什么 东南亚是指哪些地方 东南亚分布在哪里? 东南亚和西亚的位置特征和中心航道 一组三个频率 ,振幅 ,相位 的正弦电动势、电压、电流称为 交流电. 一个填空题. 空格为要填的空一组三个频率----- ,振幅 -----,相位---- 的正弦电动势、电压、电流称为 -----交流电. 已知正弦电流的初相位为60°,t=0时的瞬时值为8.66A.在t=1/300s时电流第一次下降为0,则期振幅是多少?i=Im*sin(wt+60°),当t=0时,i=Im*sin60°=8.66A,得出Im=10A.我怎么觉得答案不对呢?应该是i=Im*cos(wt+60°),这 The students taking part in the contest will listen to part of a song or a piece of music这是一道短文改错题，这一段的错误应该在哪里？请帮我找出来，然后写上正确答案， f(x)=ax-1,x2是定义域上的单调函数,则a的取值范围是最好写个大概思路 提交时卡在"Your application is being uploaded"时,怎么办? Which is the way to the bus station,please同义句 英语翻译英译中. This book___ published by the end of this year A.will be B.will C.is being D.will have been求讲解 is being done和will be done有什么区别?The English evening party ____ in the school hall next Saturday.A.is held B.is being held C.will be held D.has been held 求为什么 30分钟中之内英语题把1.His frist name is Tom.2.The natebook is on the table.3.My keys are in the drawer.4.That is my jacket.5.these are my grand parents.这几句话改成否定句,一般疑问句,肯定句,否定回答句. 1.Danny’s home is the second_______(far)to the school.2.I don't like this story .it's too （ ）A.dull B.duller C.the dullest D.dullest 谁能告诉我CELL MADE IN KOREA,FURTHER PROCESSED IN CHINA