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鸡兔共128条腿,兔比鸡多20只,多少个兔子多少只鸡? 已知实数XY满足x^2+y^2+2x+4y-20=0求 y/x已知实数XY满足x^2+y^2+2x+4y-20=0求(1) y/x (2)x^2+y^2的取值范围好的话补分 如图,∠AOB是直角,∠AOC=50°,ON是∠AOC的平分线,OM是∠BOC的平分线当∠AOC=α时,∠MON等于多少度 有鸡和兔,共有54个头,154条腿,鸡和兔各有多少只? 射高和飞行时间 射程,斜抛运动的飞行时间为T=2V0sina/g,为什么啊? At the beginning who also can not get away from who.Now who also can have no who.是什么 意思? 执子之手的英文翻译 印度语类似jiali发音的词是什么意思? 英语翻译断句有歧义！应该是 疯狂的梦 没有了你 还有什么用 str数据文件格式错误:C:\Documents and Settings\Administrator\Application Data\SogouPY\sgim_url.bin为什么搜够str数据文件格式错误:C:\Documents and Settings\Administrator\Application Data\SogouPY\sgim_url.bin检查数据更新失败 国家真的会延长退休年龄吗?公务员和工人都延长吗 MERRY LITTLE CHRISTMAS怎么样 读书随笔怎么写,有例文最好~（急） 读书随笔最好是读一本书的感受,或者是读一本书的收获, ! 600字左右水浒传读书随笔 读书随笔有吗?大家给我推荐几篇吧 如何写读书随笔 读书随笔怎么写啊? 读书随笔怎么写!求告知 求dirty pretty things的《the north》的歌词 信的结尾处写上写“此致敬礼”,请问“此”指的是什么? 英语翻译Before,I do not believe that a person will really love heartache I thought it was just the image of a statement No heart of how it will be pain Until I know you And falling in love with you I think of you a sense of heartache It seems tha 有效沟通的关键是什么,对你来说困难是什么 如何有效沟通的重要性? 有两个质量为m和M的木块,叠在一起,m在上,M在下,放在水平面上.水平面是完全光滑的.两个物体接触面不光滑.有摩擦.现在,如果用一个大小为F的力,拉在下面的M木块.这个F无论有多小,都能拉动, 有效沟通的几个关键步骤吗? 小钢球质量为m,沿光滑的轨道由静止滑下,轨道形状（因为画不出图,我来描述一下就是一个斜面高为h,上放一小球,让小球下滑,斜面底端连着一个圆弧）与光滑轨道相接的圆形轨道半径为R,要使 遇一题让我头昏脑胀.在某次应用电磁打点计时器的实验中,所用电源的频率为50HZ,实验得到的一条纸带如图所示,纸带上每相邻的两点计数之间都有4个点未画出.按实间顺序取0,1,2,3,4,5六个计数 英语翻译VincentDon McleanStarry starry night paint your palette blue and grey look out on a summer's day with eyes that know the darkness in my soul.Shadows on the hills sketch the trees and the daffodils catch the breeze and the winter chills in 英语翻译I don't why you hesitateEverytime you are near meIt is that you fearYou might fall into something deepStanding on the edge of the nightFeelings raging insideBut if you open your eyesCan you see the fireflies dancing in the airLike the sta 英语翻译I was a quick wet boy Diving too deep for coins All of your street light eyes Wide on my plastic toys And when the cops closed the fair I cut my long baby hair Stole me a dog-eared map And called for you everywhere Have I found you?Flight