古今中外的诗歌

-2（xy-3x的平方）+（5xy-x的平方）-(5x的平方+y的平方-6）x=1/3,y=-2 9.已知P为平行四边形abcd内一点,S平行四边形abcd=100,则S△pab+S△pcd=（）.0.已知平行四边形abcd的对角线相交于点0,它的周长为10cm,△bco的周长比△aob的周长多2cm,则ab=（） 2004.4.18全国铁路第5次大提速,其中进出新疆列车提速幅度最大的是乌鲁木齐至重庆的1084次列车,全程缩短了9h,已知乌鲁木齐到重庆的行程为3405km,提速前的平均速度约为52km/h,求提速后的平均速 对繁星春水的其中三篇赏析,600字以上 4道高一英语单选,1.--Come in,please.Make yourself at home.( )A.Thanks.You have a nice place here.B.Thanks.What nice food you have prepared!2.--English has large vocabulary ,hasn't it?--Yes ,( ) more words and expressions and you will find it ea ① I want to learn about your holiday ,Could you tell me how you usually__A___Thanksgiving in you country A congratulate B observe C honor D remind②It is not you but I__A_ to blame for not having completed the work .A that am B that are C which am 高一英语单选,请说明原因,1His father ,（ ） to be a great engieer ,died of cancer last yearAbeing considered Bconsidering Cto consider Dconsidered2( )got into the room ( )the telephone rangAHe hardly had ；then B Hardly ;when CHe had not 1.The Internet has__profound effect on people's daily life,but I think it's only __most important invention in history.A.a,a B.a,the C.the,the D.the,a(本题选A)2.Housing prices __sharply in the past six months,and I doubt whether I can afford a buy 高一英语单选（讲解）1.in my opinion,life in the 21 century is much easier than---A.that used to beB.it is used to Cit was used to D.it used tobe .2.how are the team playing a.got.b.gets.c.are.d.were.the discussion ---.alive when an interest 要讲解.第11题. 初二数学题（一道填空题,已知（1/x）-（1/y）=3,则代数式（2x-14xy-2y）/（x-2xy-y）的值为填空题,只要答案即可 在a处观测到点b处于北偏东60°,且距离a点500米,那么点b观测到点a,点A位于点B的______.要方法!求方法! 初二数学题（就一道填空题）已知xyz≠0,且3x-4y-z=0,2x+y-8z=0,则（x²+y²+z²）/（xy+yz+2zx）=（ ） 浙江教育出版社七年级上册英语作业本1p4p8答案 急! -3x+2x^2y+5x^2-0.5x^2-x^2y-x^2y,其中x=2,y=-3/1/2 求多项式的值 三道填空题使式子1+x-1分之1是有意义的的x的取值范围是------.一个正多边形的每一个内角都等于140°,则它是------边形.若方程x-5分之x=2-x-5分之m,则m=------. 求1到高一英语单选的解析1.Did you post the letter for me?Oh,I forgot.I( )it now.A.will be post B.will postC.am going to post D.am to post 初二数学一题填空题木工做一个长方形的桌面,量得桌面的长是60cm,宽是32cm,对角线是70cm,这个桌面是____（填合格还是不合格） 1.He is not the man ____ he used to be.A.that B.who C.whom D.which2.Not only ____ the car he ___ been sold by his son for gambling debts but also his new house A./has B.has/had C.has/ has D.was/has 3.The theory he's stuck ___ us that earthquakes can A49．I’ll never forget those days _ I spent in the country with the farmers,_ has a great effect on my life.A．that; which B．which; what C．when; which D．when; that （为什么用that引导?）D51．—May I look at the menu for a little wh 100字美文摘抄及100字赏析 要10篇 要配套的 求100字美文摘抄,带赏析序号标上，赏析跟在文段后面最好出自名著，答好了我再加10分 需要10篇 初二数学,13-20 7道填空题,求解答,解答必给好评 1.Jack went overto the girl,with____ he would go to watch the gym competition.A.that B.which C.who D.whom2.I 've recently bought a car,most of ____ parts were made in ChinaA.that B.which C.whose D.those3._____is China's best basketball player.YaoMing 5x-y=16 3x+2y=20是一个方程组.不要给我一个答案直接出来. 5x-2y=64 2y+3x=6 5x-2y=12 3x-2y=6 消元法 高一英语定语从句It is said that we will move into the new school next term,( ) it will be completely finishedA.by the timeB.by which timeC.by that timeD.by this time请说明为什么 好文摘抄300字 经典散文（300字摘抄及100字点评）从《经典散文》这本书中寻找五篇散文摘抄其中300字并加100字点评,（共五篇）急需! 求好文段摘抄100字并赏析20字,仿写20字 P22页的地球与宇宙!第7题,如图3—1,S点的经、纬度分别是 和 ,它属于 （填“东”或“西”）半球和 （填“南”或“北”）半球.从纬度上看,它属于 （添“高”、“中”或“低”）纬度.第8题,