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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 解方程0.25分之1.25=3.2分之x 用词的正确形式填空 it is said that he is had the machine （ ）【check】 初中英语缺词填空 急Mr.sun is a kind old man.One day,he bought a bird at the market and wanted to set it f_____,so he went to the forest.But to his surprise,the t________ were gone.People had cut them d_______,leaving only fallen ones and stu 一题用所给词的适当形式填空,There are______(thirtieth)students in our class. 初中英语缺词填空What will you do if you meet a robber on you way h___?You will shout for h___?You will run a___ the robber?You will c___ 110 for help?Maybe you will do n___,because you think it doesn’t matter.But next time,the robber robs y 初中英语题用括号内词语的适当形式填空1、Bob's and his sister's（ ）（room)are very tidy.2 He wants( )(be)a police.3 The food( )(be)very healthy.4 It's easy( )(learn)English.5 Mary can ( )(play）basketball well.6 There are four( 用定义法做 已知f（x）+2f（-x）=x^2+2x,求f（x）我是这么写的：将原式中的x与-x互换,得f（-x）+2f（x）=x^2-2x……①然后f（x）+2f（-x）=x^2+2x……②最后①②联立方程组消元 用配凑法求函数解析式 题如下已知f(x+1)=x^2-2x,求f(x) 如果不等式3x-m≤0的正整数解是1,2,3,求m的取值范围 解方程：x+3分之1x=28和x-3分之2x=4分之3快 Is Japan _____ Asia country or _____ European oneA.a the B.an the C.a a D.an aKate,it's getting cold ._____ take a sweater with you A.Why don't you B.What about C.Why not you D.Would you like ,place与room（翻译为“空间”的意思时）的区 高中数学必修四求函数解析式 求解答案 详细过程已知函数f(x)=cos(2x-3/π)+2sin(x-4/π)sin(x+4/π) (1) 求函数的最小正周期和图像对称轴方程（2）求函数在区间 【-π/12, π/2 】上的值域