意大利人的性格

七年级英语练习请说明理由!答得具体才能得分.1The boss asked Tom to do a lot of work.So he______late tonight.A.needs to work B.need to work c.needed to works D.need works2.It takes less time ____by air than by train.A.traveled B.to t 英语现在进行时的练习题要七年级冀教版的不要复制的，复制的我都看了 七年级上册英语练习题!连词成句.将下列单词重新排列,组成正确的句子（注意标点提示）sister,where,work,does,his_____________________________________?writes,month,Jack,me,to,every_____________________________________.sh 下列多项式是二次三项式的是（） A：x+y B:3a+2b+c²b C:x²+2x+1 D：a³+b³ 写出下列多项式中各项的系数和各项式的次数 3a²-b.3x²-4x²y+5写出下列多项式中各项的系数和各项式的次数 3a²-b.3x²-4x²y+5y² x/2-y/2.3x-4y/5 一道初中的代数题：1.当k是什么整数时,关于x的方程kx方-4x+4=0.(1)与x方-4kx+4k方-4k-5=0.(2)的根都是整数“方”是二次方！ k为何整数时,关于x的方程kx²-4x+4=0与x²-4kx+4k²-4k-5=0的根都是整数 一个多项式与单项式-3a²b的的积是a³b-三分之一a²b²,求该多项式如图,小路 已知矩阵A=diag(1,2,-3),求A的m次多项式=A³＋2A²－3A具体的f(1).f(2)f(-3)是怎么来的,完全不理解啊 英语翻译____it is true that a students most important goal is to do well in his or her studies it doesnt need to be the only goal .A when B as C while D before 英语翻译you'd better be careful Lina the knife is sharp-----mum .A i won't B make it C got it D it's impossible 英语翻译the university has an international ------for excellence in teaching high-quality research and flexible learning opportunities .A reputation B fortune C contribution D knowledge 英语翻译nothing can discourage him from------his promise for he is a very honest man.A carryingB breaking C performing D making 英语翻译can you tell me how long dinosaurs -------- on the earth before they---------?A had existed ; disappeared B had existed; were disappeared C have existed ; disappeared D have existed ;were disappeared 已知关于x的一元二次方程5x+kx-6=0的一个根是2,求方程的另一个根及实数k的值. 高中数学函数,8-10三题求过程 问3道高中数学函数题目 6._____ entering the classroom,he found his students all talking and laughing loudly.a.to b.forc.asd.on7._____ charcoal and sulphur,potassium nitrate forms an explosive mixture.a.to combineb.the combination ofc.when combined withd.combining The poor child expressed the desire that he _____all the books he needs为什么填have而不是will have?-Have you seen the film ''2012''?it's quite thirlling-No ,I -------to buy a ticket ,but it ___cats and dogs为什么答案是have intended；was 已知关于x的一元二次方程x^2+kx-1=0(1)求证;方程有两个不相等的实数根(2)设方程的两根分别为x1,x2,且满足x1+x2=x1x2,求k的值 已知关于x的一元二次方程,kx+(2-6k)x+9k-1=0,当k取什么值时：（1）方程有两个不相等的实数根（2）方程有两个相等的实数根（3）方程没有实数根变式：当k=____时,关于x的方程kx^2+(2-6k)x+9k-1=0有实 已知关于x的一元二次方程x^2+kx-3=0.求证：不论k为何实数,方程总有两个不相等的实数根 几道高中数学函数题,求过程1）函数f(x)=-x²+2x+1在区间[-3,a]上是增函数,则实数a的取值范围是___2）函数f(x)=x²+ax+b-3(x∈R）的图像经过（2,0）,则a²+b²的最小值是___3）函数f(x)满足f(ab 若方程x²+4x+k=0与方程x²-3x+k=0有一个公共根,则k=? 在线,跪求过程和答案 7分之5+x二3 解方程 1.An i___ conference will be held in Beijing next month.2.Most first-class footballers are natural a_____.3.The writing of poens ,stories or plays it often called c____ writing.4.The Olympic winner received gold m____ as an award.5.——What's in th x-七分之二X=二十八分之十五（解方程） 如果不等式3x-m≤0的正整数解是1,2,3,那么m的范围是? 1、函数F（X）是偶函数,G（X）是奇函数,且F（X）+G（X）=1/（X-1）.求F（X）的解析式.2、设2次函数F（X-2）=F（-X-2）.且图片在Y上截距为1,被X轴截得的线段长为2倍根2,求F（X）的解析式. 填一个最适当的词.1.We all remember what he said yesterday.No one ___ his words now.2.Listen to the radio!The president will tell us the final _____.3.How long will you____ there?You have several subjects to choose. 解方程：（0.25分之X+2）+（0.5分之X）=1 解方程： 2分之0.25=x分之1.25