甲乙两车同时从A向相反方向行驶，分别开往B和C，已知AB之间的路程是AC之路程的9/10，当甲车行驶

第5题,怎么做?要过程的,一定好评谢谢 的4、5两题, 4 5两题, 第四题怎么写,快点有正确答案必好评 4,5两题, 求4,5两题好评先到先得 这4道题怎么写啊 ,第4题怎么写 第四题怎么写啊? 第四题怎么写, 这四题怎么写. 第五题,采用换元方法 虽然是选择但还是要有过程 第五题选什么?要过程. 第五题选择写过程 已知a=2b不等于0,则a/b的值是多少A,2 B,1/2 C,3 D1/3 还有第五题选什么 第5题,请问有没有数学方法计算答案? 这题选A对么,若不对,怎么选,说明理由29．Once ____ the forest,you ought to remain ____ you are waiting for help．A．losing; where B．losing; there C．lost; there D．lost; where 请问这题选什么,A行吗,若不行,说明理由24．Most people go to the theatre not to see a play ____plot is complicated, but to listen to brilliant dialogues between actors． A．where B．what C．which 这题应该选d还是a,说明理由. 这道题选什么,说明理由5.The modern camera lens may be coated with more than ten _______ for each piece of its glass.A.levels B.stories C.layers D.formations 这题选什么?说明理由 1.Susie always takes an active part in outdoor activities.(保持原句意思）Susie _______ always ________ in outdoor activities.2.I've got two tickets _______ Sunday's evening show.Will you please go with me A.to B.of C.at D.for3.Ihave got a coin 5道英语题目 说明理由1.The scientists found it was not possible to fly in the 18th century.(保持句意不变) The scientists found ________ ________ to fly in the 18th century.2.The boy came to the world in 1970.(保持句意不变) The b 1.Five years ________ since he died.A.have passed B.has passedC.is passed D.are passed2.—Which calculator do you want?—________in your hand.A.The one B.One C.That D.It3.There is no smoke ________ fire.A.with B.without C.if D.no4.—What's under t 这道题要有思路要有证明谢谢谢 第五题用证明的方法怎么做 一道证明题,给我些思路正方形ABCD中,点E是BC的中点,BG=1,CF=2,且∠GEF=90°,求GF=? 科学第五题求教,说明方法谢谢 证明:第（2）、2题 第五题怎么证明