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初二变量与函数练习题及答案 观察下列各代数式：a^2;|a+1|;-a的平方根；2（3次根号a）.取一个适当的数代入求值后,则其中必定不能互为相反数是（）和（） 2.化简求值 5(2x²y-3x）-2（4x-3x²y）,其中x＝2分之1,y＝-13.已知A＝x-x²＋1,B＝x²-1＋3x,求A-2B的值. 请你分别说出一对自变量与函数的对应值,并说出它的实际含义 初三英语题,求好心人解答 英语一般考70多,满分120,英语以前就不好,基础很差,不怎么背单词,我现在想好好学,我改怎么学 初三英语词组,求好心人解答 有所给单词适当形式1.They enjoyed ______ (they) last Sunday.句型转换1.The teacher said,"The moon goes round the earth."(改为间接引语）The teacher told us the moon ______ _______ the earth.2.The teacher said to us:"Don't make a nois 一变量与函数问题~等腰△ABC周长为10,底边BC长为y,腰AB长为x,则y关于x的函数关系式是________,自变量x的取值范围是________,因变量y的取值范围是__________. 一道关于变量与函数的题 一道初三英语填空题A:I'm not feeling well.I have a cold.B:( ) you ( ) to the hospital yet?A:Yes,I have. 一道初三英语填空题~1.what about reading aloud ____(practice)pronunciation? 初三英语1题(填空题)i made a chocolate cake ______(特意的)for you最准确的最简单的最后 Thanks to you 一个初三英语填空题Traditional Beijing opera is( )to the music courses in 200 schools in China.（增加） Walking at school ____made Mr.green stressed out. 求经过p（－2,4）,q（3,－1）两点,并且在x轴上截得的弦长等于6的圆的方程? 已知数列｛an｝中,a1=1,且Sn,Sn+1,2S1成等差数列,用数学归纳法证明Sn=(2^n-1)/2^(n-1) 在数列 an 中,a1=-2/3 其前n项和Sn满足an=Sn+1/Sn+2(n>=2).用数学归纳法证明Sn=-(n+1)/(n+2) What is the weather like this summer here?-There_____very little rainA.has B.has been C.are D.have been为什么选B?2.Have you got your book,tony?-yes ,i have .we all got it __the ones who had already taken thema.expect b.including c.among d.with 1、-Inventors have changed the way we live.-So they are famous for the great things they_____.A,do B,did C,are doing D,had done应该选B,但为什么不能选D的完成时呢2、although i am beginning to feel more comfortable about depending on my 答得好再加!用方程!（最好是一元一次方程））北京市实施交通管理新措施以来,全市公共交通客运量显著增加.据统计,2008年10月11日到2009年2月28日期间,地面公交日均客运量与轨道交通日均客 有两位同学在踢足球之余研究了足球上黑白块的个数,发现黑块呈五边形,白块呈六边形,而且黑白相间,白块多一些,他们输出了黑块有12块,但数白块时两个数的个数却不一样,你能用方程帮他们 His new book was a great __________ (succeed).My little cat’s death __________ (sad) me.They achieved much __________ (successful) in their work.The car is so expensive.It is _________ (afford) for me to buy it.On the evening of our __________ (gra Come on,I want to tell you a secret now.But you must ----------it from other people.A.remain B .see to C.leave D.prevent选.see to 球解,小学六年级数学题 1.小红家有一个小方桌,桌面的边长1cm,如果把它的四边撑开,就成了一张圆桌面,球原桌面的面积是多少2.XX学校组织了30名学生去公园游玩,由6名老师带领.公园售票处写到：每人凭票入门.儿童, 怎么快速求出二项式系数的和?还有怎么快速求二项式中系数之和? 数学二项式中所有项系数之和是多少?二项式系数之和为多少? 各项系数之和,二项式系数之和的区别是? 数列an中,a1=a2=1,且a(n+2)=a(n+1)+an,用数学归纳法证明：a5n能被5整除 数列{an}中,若a1=a2=1,且an+2=an+1+an(n∈N^2),用数学归纳法证明:a5n能被5整除 数列｛An｝满足An+1=An^2-nAn+1,A1=1,求A2,A3,A4,并猜想An的一个通项公式,并用数学归纳法证明A（n+1）=An^2-(nAn)+1