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请帮我解决1道几何题!已知：PA,PB与圆相切于A,B.M是弧AB的一点,MD垂直AB,MG垂直PA,ME垂直PB,垂足分为D,G,E,求证：MD平方=MG*ME 请大家帮忙解决一道几何题.已知直角三角形ABC的两直角边AB=4,AC=3,P为其内一点,PD垂直BC于D,PE垂直AC于E,PF垂直AB于F,设PF=x,PE=y,PD=z,且4/x+3/y+5/z=12,则P定是三角形ABC的（ ）内、外、垂、重心. be busy with sth的中文 求解决一道几何题.如图,四边形ABCD是矩形,对角线AC、BD相交于O,CE平行DB,交AB的延长线于E.求证AC=CE 帮我解决一道几何题如图,已知OA⊥OB,OC⊥OD,∠BOC：∠AOD=3：5.求∠BOC的度数 be busy with sth My father works ______ a bank in the USA be popular with something be busy with sth.什么意思 如图,在平面直角坐标系中,四边形各顶点的坐标分别为,A(0,0),B(7,0),C(9,5)D(2,7)1)求此四边形的面积2）在坐标轴上,你能否找到一点P,使S△PBC=50,若能,求出P点坐标,诺不能,请说明理由 My father works in the bank..(改否定句) my father works in a bank 改成否定句 she is satisfied with the hourse是过去分词satisfied作表语,那么with the hourse 是什么句子成分?the library is closed.the cup is broken.是很明显的过去分词作短语 请问下有谁知道高中生物题目求解就告诉我吧我在此先感谢大家7Z 求助大家高中生物题,求详细解释!会的人说下嘛,十分谢谢大家了7Z 在2,4,6.396和398这些偶数的数列中,数字2共有多少个 强强数了数发现他前面的人数是总人数的3/4,排在他后面的人数是总人数的1/5.从前往后数强强排在第几?急 雅思阅读文章哪里来 六（1）班排队,强强前面的人数是总人数的3/4,后面的人数是总人数的1/5,从前往后,强强排在第几位? 他发现排在他前面的人数是总人数的4分之3,排在他后面的人数是总人数的5分之1.从前往后数小强排在第几位? 新颖的作文结构如:写读书.(随便说)不是指哪本书的读后感,是泛指读书.象很多中考满分作文那样. 如何是作文更加新颖?我要结构哦 我们老师说我写作文老用小标题,她看腻了.呵呵.谁能再给我介绍几个啊 作文结构怎么样就新颖了? 作文结构有没有新颖一点的 为什么最近几个月都没有看到星星 设x~n(1.5,4),计算p{x2.5}.（只写表达式）,随机变量x的数学期望和方差分别是多少?画出x的概率密度函数的草图 求阅读理解答案“Cool” is a word with many meanings“Cool”is a word with many meanings．Its old meaning is used to express a temperature that is a little bit cold．As the world has changed,the word has had many different meaning．“Co 连词成句：with,is,"Cool",a,many,word,meanings. ''Cool'' is a word with many meanings.It means a little bit cold at first" Cool " is a word with many meanings.It means a little bit cold at first.As the world has changed,the world has got many different meanings." Cool " can be used to express feel 阅读答案“Cool”is a word with many meanings．Its old meaning is used to express a“Cool”is a word with many meanings．Its old meaning is used to express a temperature that is a little bit cold．As the world has changed,the word has had m 英语翻译Class Two ( ) ( ) on English lesson now.The teacher ( ) ( ) near the blackboard writing some Eglinsh.word on it ( ) ( )the words at the words ai the same time.All the students ( ) ( )ai the blackboard and ( ) ( ) him.Only Mingming ( ) ( ) 关于酸碱中和滴定我们书上说醋酸滴定氢氧化钠应用甲基橙作指示剂可是醋酸和氢氧化钠反应不是生成醋酸钠吗?醋酸钠不是显碱性的吗?甲基橙变色范围不是3.1-4.那岂不是醋酸过量了?怎么可