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几道 急 1.当 x>1是化简 -------------------√（x+1/x）的平方-42.平行四边形的两邻边是3和5,它的一个锐角的角平分线把场边分成的两条线段的长是 3.已知一个梯形的四条边长分别为1,2,3,4,则此梯形的面积为 《繁星春水》的赏析,100字左右,50字左右也行。 1 在直角三角形ABC中,角ACB=直角 CD垂直AB于D 已知BC=3 AC=4 则CD=?2 在三角形ABC中 AC=BC CD垂直BC 交AB于D 已知角B=30度 AD=3CM 则BD=?CM3 在三角形ABC中 BD平分角ABC 且BD=13 BC=12 DC=5 则D到AB的距离是?4 在直角 繁星春水40-50赏析 1.若a=-0.3^2,b=-3^-2,c=(-1/3)^-2,d=(-1/3)^2,则a,b,c,d的大小关系是________.2.如果6/7=6(5a+2)/7(5a+2),那么a的取值范围是_______.3.若x^2+3x-1=0,则x-3/3x^2-6x÷(x+2 - 5/x-2)=________.4.若m/a^2-b^2 - 2ab-b^2/a^2-b^2 = a-b/a+b,则m=____ 繁星春水写作赏析（500字）对整本书的写作赏析,也可以对其3.4首进行赏析让我借以参考参考~拜托了我实在是不大能看出有什么独特写法可以对每一首小诗进行赏析……拜托大家了 1.代数式x的平方+ax+b 当x=2时 其值是3 当x=-3时其值是4 则代数式a-b的值是2.x+2y-4z=0 3x+y-z=0 则 x y z 的比例是多少3.1张方桌由一张桌面和四根桌腿组成 已知1m的立方 可以做桌面30个或者桌腿300个现 繁星春水赏析20~30字 -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