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A={a平方,2｝B={1,2,3,2a-4} C={6a-a平方-6},如果C属于A,C属于B,求实数a的取值集合 抛物线y平方=2px(p>0)的动弦AB长为a（a>=2p）,则弦AB的中点M到y轴的最短距离为? Tom__look after his mother.She has been ill these days A.have to B.has to C.had to D.will have to Tom came home with a very serious look on his face.翻译 Look,Tom is making ___(face)如题 tom never works hard at his lessons,so it is not___to see a ___look on his face after the exam.A surprised disappointing B surprised disappointed C surprising disappointing D surprising disappointed 选D 为什么 二次函数的顶点与X轴的交点围成的三角形为直角三角形△是多少如题会+分 哈哈 我算出来是4 哪个人写的多久哪个了 the noise brought the kangaroos running into the room(running作什么?）在句中充当什么?为什么用ing? 已知三角形的三个顶点都在以下表格的交点上,其中A（3,3）,B（3,5）,请在表格中确立C点的位置,使S△ABC＝2,这样的点C有多少个,请分别表示出来. 2a^2-7a+2和a^2-6a+1怎么比较大小rt I have some pen pals in the Uuited States改疑问 英语翻译Joh is from Australia We often chat on the Internet John likes pbying soccer very much His favorite soccer player is Ronaldo He wants to go to China and learn I have already been to Water World with my parents.（改为否定句） 雅思阅读判断题缩写了真的全部算错吗? 雅思阅读是非题...我把YES/NO/NOT GIVEN简写成 Y/N/NG 不知情况会如何 2014.05.10雅思阅读判断题写成简写了, 雅思阅读简写了扣分吗?就是21号考试的时候把TURE/FALSE/NOT GIVEN 写成T/F/NG了.考完才想起来,要被扣分了1450就没了. 2010年8月21日雅思阅读判断题写成缩写扣分吗,小弟成绩下来貌似扣了, 五年级下册数学第一课堂苏教版答案 急! 广州出版社的 高一两道英语定语从句的句子,求大神1.I must make full use of the time ( )left to me and do as much as I can to make progress. A which. B that. C there is. D when为什么选C,B哪里错? 求视频:已知三角形两角及夹边求作三角形 已知两角和它们的夹边做三角形 已知两角一边(不是夹边)作三角形怎么作啊?初一下期5单元的 The boy got up after his mother came into hie room.(用not…until改写) Tom ----(冲)into the room because a dog was running after him. ten minutes later 和ten minutes after 区别Ten minutes ______ starting to pick up litter,my bag was full!答案上是after 但是我还是觉得是 later 我以前看到的 好像这种情况下都是later 或是 after ten minutes 中心原子不是1怎么算孤对电子?比如说乙烯,乙炔? 用英语"英语报纸"怎么写 报纸的英语是怎么写的 已知三条边的长怎么画这个三角形?条长是40,50,60. 根据以下已知条件能唯一画出三角形ABC的是?A.AB=3,BC=4,CA=8B.AB=4,BC=3,角A=30°C.角A=60°,角B=45°,AB=4D.角C=90°,AB=6