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小芳想在墙壁上钉一个呈直角三角形的三角架,其中两直角边长度之比为3：2,斜边长（根号520）.求两直角边的长度（保留3个有效数字） 请问苏教版七年级下册语文书后面的古诗词有哪些?需要原文,所有的有书的帮帮忙没有课外古诗词背诵吗？ 高一英语短文改错题求助Good health is the person's most valuble possession.today,it is much easier to be healthy than it was the past.Modern people know more than health,have better food,and live in clean surroundings .Also ,scientists and 短文改错(共有10个错误)I like English teacher very much.She is a 23-year-old girl which English name is Linda.She is very kindly to us and she always asked us to call her Linda.She didn't like English very much when I was in the junior middle 高一英语短文改错,急My friend Henry has a most unusually hobby 56． ＿＿＿＿＿（爱好）． He likes plant flowers in strange places． 57． ＿＿＿＿＿When the spring comes round,you can always tell 58． ＿＿＿＿＿Henry ha 高一英语短文改错Last Sunday moening ,when I was having a walk in the park near my home ,I came across a crew make a new film with one of my favorite actor .I didn't have my camera with me at time ,but I rushed back home to get .Unfortunately 求高一英语短文改错高手每篇十个错,一共有两篇,也就是二十处错误.第一篇：It snowed last night.This morning the road covered with snow ,but there we're still a lot bikes coming and going.Suddenly I saw a woman walk off her 已知:BD=DE,AE=CE,AC=3根号2,∠ABC=45°∠ADC=60° 问：BC=? （1）已知：a^2-3a+1=0,求a^2+1/a^2的值.（2）1/a^2+1当a为什么值时这个分式无意义? 在平行四边形ABCD中,AE⊥BC,AF⊥CD,垂足分别为E,F,∠ADC=60°,BE=2,CF=1,连接DE交AF于P,求PE的长.（此图不全,请连接一下ED） 在三角形ABC中,点D,E分别在AB,AC边上,F是CD中点,连接BF交AC于E,角ABE+角CEB=180°,比较线段BD与CE的大小,并证明你的结论 根据下面的图的公式如何用matlab 仿真α>2 求助：有公式怎么在matlab中仿真出下面的图形? 想用MATLAB仿真出如下图,希望大家指点一下•图中实线为x1,y1的,x2,y2为虚线,此运动仿真是如何在matlab中实现的?请教各位大神啊!•a=160mm,b=80mm,v=0.72m/s,如图所示： 初二数学,快点 甲乙两个工程队都参与了某快速大道某段的改造工程甲队单独施工一个月完成总工程的1/3,这时增加乙队两队又共同工作半个月总工程全部完成,求甲.乙哪个施工速度快 1、(x^2-4y^2)/(x^2+2xy+y^2)÷(x+2y)/(2x^2+2xy)2、(2x)/(5x-3)÷3/(25x^2-9)×x/(5x+3) 初二数学,快帮我随着大陆惠及台胞政策措施落实,台湾水果进入了大陆市场,一水果经销商购进了A,B两种台湾水果各10箱,分配给他的甲乙两个零售店销售,预计每箱水果的盈利情况如下表 初二数学快点 Help me~1.如图,D、E分别是AB,AC的中点,CD⊥AB于D,BE⊥AC于E.求证：AC=AB.2.如图,在等边三角形ABC的三边上,分别取点D,E,F,使AD=BE=CF.求证：△DEF是等边三角形.3.一次函数y=5x-b是由正比例函数______向______ 数形结合,以及本节课大家体会到无限逼近思想在数学中都有相当重要的应用,其实大家在6年纪学习圆的面积就是初步体会了无限逼近的思想.请大家通过此题进一步体会这两种思想在数学中的 help me~如果X和y是0,1,2,……9中的两个数字,z是自然数,试问有多少对x和y,使10^z ×x+y能被9整除? 如图,梯形ABCD中,AD平行BC,E是AB的中点,EF⊥CD于F,求证:S梯形ABCD=CD乘以EF 如图,∠1=∠2,∠3=∠4,D是AE上任意一点.求证：（1）BD=CD；（2）BC⊥AE 等腰梯形ABCD,AB//CD,AC=10,高为8,求S梯形是___ 1.甲,乙二人在一圆形跑道上跑步,甲用40秒跑完一圈,乙反向跑每15秒和甲相遇一次,求乙跑完一圈需要多少时间?2.甲,乙二人各骑自行车同时从A地出发到B地,并都立即返回,甲的速度快,当他返回时 在四边形ABCD中,AD=BC,AB=CD,对角线AC,BD交于O.若AD=20,AC=18,BD=26,求△OBC的周长. .快...铁路上有东.西两站,两列火车同时出发.甲列车从东站开往西站,乙列车从西站开往东站.假设两列火车各自的速度都是均匀不变的,当两列火车在途中相遇时,甲列车再过1小时才到达西站,而 初二数学、快.要过程①.8m²n+2mn②.12xyz-9x²y²③.2a(y-z)-3b(z-y)④.p(a²+b²)-q(a²+b²) 一道高一英语短文改错题Dear Lucy,From your last letter I know you meet with difficulties in learningChinese .But you mustn't worry about it .If you try hard ,you'll surely makegreat progresses .Here are some advice for you .Firstly ,you sho 3X (5X+1)-26>5X 5x一3x=3.2