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在直角坐标系中,点M（-7,7）,过点M、O作圆O1,O1E垂直x轴于E,当O1E=3时,求圆O1的半径r 如图,梯形ABCD中,AD∥BC,CD⊥BC,已知AB=5,BC=6,cosB=3535．点O为BC边上的动点,以O为圆心,BO为半径的⊙O交边AB于点P．（1）设OB=x,BP=y,求y与x的函数关系式,并写出函数定义域；（2）当⊙O与以点D为圆心,DC 一道初三数学综合体的第二小题 在空间直角坐标系中x+y+z=0表示什么图形? 怎么提高英语六级听力成绩 六级英语听力应该怎样提高成绩?谢谢! 英语初级题求助请问 jump off 和 jump out of 是一个意思吗?the building is on the left of the park.the building is on the left,beside the park. WAIT FOREVER It is as good as could expect还是It is as good as I could expect?The plane is captable of two__________ (day) flight.填days还是days' 例如静电屏蔽类的 关于英语里中文式姓名的顺序问题假如有个人叫李明,他和外国人介绍自己的时候是应该说I'm Li Ming还是I'm Ming Li呢? 圆X^2+Y^2=8内有一点P（-1,2）AB为过点P的弦,分别求满足下列条件的直线AB的方程.（1）弦AB最长 圆x^2+y^2=8内有一点P(-1,1),弦AB被点P平分,则直线AB的方程为 求高手做一道英语单选_____ I would see you here.A.Little I dreamed B.Little do I dream C.I dreamed little D.Little did I dream I can say nothing — we haven’t ___________ to any decision on the matter now.A.come B.got C.turned D.gone为什么选A 怎么翻译 一道英语单选,My friend,who__on theInternational Olympic Committer all his life,is retiring next month A served B is serving C serves D has served what is the biggest animal on the earth 五年级下威尼斯小艇小练笔我的家乡在汕头,最慢到明天! 五年级语文下册26课威尼斯小艇是什么样子 英语单选一道~did everyone in your class work out that math problem no,__only yangbei and i who____.a.they were ,did b.there was ,did c.it was ,did d.there were ,was 英语单选.一道.the famous professor has several lectures ( tio attend ) every day.为什么不用attending 英语 小学用所给词正确形式填空,这类的题目如何去做,主要变换哪几种形式,如何变换?明确具体些, 急求牛津英语7AU4至U6用词适当形式填空50道要有中英文,不要单中双英之类的 英语和汉语在语言上的差异 用所给词的适当形式填空 急一会考试The tie is my ___[grandpa] My son likes____[swim] Please stand behind______[he] My mother is___[tall] than my aunt Can you ____[see] the picture of the butterflies on the wall?It's cold ___[do not] tak 威尼斯小艇小练笔350字左右 中文和英文的语言习惯差异 ________season do you like best?_______is the biggest animal on the Earth?A.What B.Which两个选择一样吗?为什么 1.what is the biggest animal n the earch?回答这些问题. 帮我看一些这句语法对不对,重点帮忙看看语法 because i am afraid that the movie what is happen into reality.这句话对吗?因为我怕电影所发生的变成现实.如果不对,能够给我写句正确的吗? 不要方程 威尼斯小艇的小练笔我要大连的,马上就要,快呀,越快越好!急急急!好的提高悬赏