如图，已知三角形abc中，交acb等于90度，ac等于bc=3d在ac上ad=2cdde垂直ab垂足

3x+5y=21 2x--5y=-11 这个二元一次方程怎么解? 新目标英语八年级上册听力P86页的4——5单元的听力和翻译. 新目标英语八年级上册(课本同步听力)mp3(Go for it ) 可以发给我么?rt... 谁有外研社版初一英语（上）Module 1 的学案?就是Nice to meet you那一模块,随便一个就行. 关于诚信和不诚信的例子有哪些? 不诚实守信的故事 有关不诚实的故事最好半小时之内! 谁知道火鸟火鸟朱雀用英语怎么说火鸟,传说是阿拉伯的一种神鸟.当太阳投射在沉积六百年的香木上引燃时,火鸟就会扑扇着翅膀投奔进火焰中,燃烧自己.这是一个有关爱情的主题,当火鸟投身 不诚实的故事 谁知道火鸟朱雀用英语怎么说火鸟,传说是阿拉伯的一种神鸟.朱雀：别称凤凰,火鸟,不死鸟,七色鸟,天堂鸟,彩虹鸟. 当太阳投射在沉积六百年的香木上引燃时,火鸟就会扑扇着翅膀投奔进火焰中 谁能写几句2012年新年贺卡祝福语 三年级上册英语男孩怎么读 有关诚实的故事有哪些? 关于诚实守信的故事. 英语填空,选择合适的选项,the naughty boy got in his bedroom-------- the window.A.acrossB.overC.throughD.in--------the help of man-made satellites ,we can know what the weather will be like in the next few days.A.UnderB.WithC.UsingD.By 初二英语三道选择 初二英语选择三道1.I _____over my lessons by ten o'clock.Then I_____a rest.A.went ;had taken B.had gone;takeC.went took D.had gone;had taken2.How happy they were______each other!A.to see B.seeingC.see D.saw3.The living standard of the people i 三道初二英语选择,急 诚实小故事,要很短哦 3道初二英语选择,( )1.We spent three hours ____ our homework.A.do B.in doing C.to do D.on doing( )2.The boy was born _____ the 3rd of July,1989.A.in B.on C,at D.by( )3.We didn't go out to play _____ the bad weather.A.because B.because of C.met 英语 任务阅读 英语初三阅读,急 如果初三到国外读书,英语要达到什么水平呢? 空的3小题 六级541,准备考商务英语高级去年12月份考的六级,裸考,主要是完型几乎没得分,听力很好,口语不行,可以考商务英语的高级吗?还有,拿到商务英语的证书有哪些作用? 我六级过了 分不高 勉强过的~ 现在想考bec中级 怎么样 怎么准备 有经验的人请给点建议 谢谢 求曲线xy=1在（1,1）处的切线方程与法线方程 最后一个星期 怎么准备六级 有经验的进哎 我这是第二次考六级了~第一次考421~这次心里还是有点慌~我感觉我阅读不行~上次只有一百三十分 听力一百五~阅读是我的痛~ 急用急用,星火四级听力10份左右（听力题目文本+听力原材料文本+听力mp3）, 1.Themother_B___about the children when they didn't come home from school.A.is upset B.was upset C.was upseting D.upset 2＿A＿the child if he doesn't behave well,and he'll soon stop.A.Ignore B.Ignoring C.Ignored D.To ignore3.We're having a discussi i ______freedom of speech for everyone ,no matter what color ,race or nationality he is.a .stand for b.stand out When he hurried back to the village with 999 red roses and a large sum of money ,only ( to be told ) the girl had got married the day before.A told B telling C to be told D being told