建筑工地需用沙石400立方米两种方法写出

1、函数y=x*x+2(a-2)x+5在（4,正无穷大）上是增函数,a的范围是?2、对a,b属于R,记max{a,b}= a(a≥b) b(a光有答案有什么用，而且，非专业好学生别答。好心耐心专业答 英语翻译When it is null routed it is totally blocked in the network and we cannot allow one IP.Your server will be back up after the null route has been removed and you will have access to your server and all your data as before. 高一数学,第五题,谢谢啦 第五题这样做对吗?高一数学 关于x的一元二次方程2x^2-kx-1=0,求证:方程有两个不相等的实数根；若方程的一个根是-1,求另一个根及k的值关于x的一元二次方程2x^2-kx-1=0,求证:方程有两个不相等的实数根；如果方程的一个根 英语翻译翻译:你所看到的不是事实.这棵树高16米.我们应该告诉大众关心动物.我习惯在9点吃早饭.我没有足够的钱购买那辆小汽车.Miss Black ___(be)a doctor there for about five years.We will go to the park wh 已知函数f(x)=In(ax+1)+[(1-x)/(1+x)],x≥0,其中a>01.若f(x)在x=1处取得极值,求a的值2.求f(x)的单调区间3.若f(x)最小值为1,求a的取值范围 关于函数的三道高中数学题目.1、已知a²+b²=1,b²+c²=2,c²+a²=2,求ab+bc+ac的最值.2、以知x>0,y>0,x+2y=1求1/x+1/yde 最值.3、设x>-1求函数Y+﹙x+5﹚﹙x+2﹚/x+1的最值. 1.某商品销售量y（件）与销售量x（元/件）负相关,则其回归方程可能是?A.y=-10x+200 B.y=10x+200 C.y=-10x-200 D.y=10x-200 2.若曲线y=x平方+ax+b在点（0,b）处的切线方程是x-y+1=0,A.a=1,b=1 B.a=-1,b=1 C.a=1,b=-1 D.a=- 若二次函数f(x)满足：f(2x)+f(2x+1)=13x平方+6x-1 求f(x)的解析式 1、已知函数y=f（2x+1）是定义在R上的奇函数,函数y=g（x）与函数y=f（x)图象关于y=x对称,则g(x)+g(-x)等于多少?2、设函数f（x）=loga^x（a>0,a不等于1）满足f（9）=2,则f^-1(log9^2)的值是多少?3、已知函 急,非常急,急得很! 2012年八年级下册苏教版暑假作业答案谢谢了,大神帮忙啊 人教版英语八年级下册暑假作业答案 求求你们啦!救命的! 1.Students shouldn't say "get out"or___rude remark.A.such any B.a such C.some such D.any such.2.-Which newspaper shall i buy?-___,whatever they have in the shop.A.anything B.someting C.any one D.some one3.Miss Green has classes ___day,Tuesdays,Thursd 1.Mary learned Chinese for about three years,___is,from 2002 to 2005.A.this B.that C.it D.which2.We are told that he will come tonight.If so ,we will hold the meeting .if __,there won't be any meeting tomorrow.A.that B.not C.don't D.won't 1.The bank is reported in the local newspaper____in broad daylight yesterday.A.robbed B.to have been robbed C.being robbed D.having been robbed2.as a result of my laziness,i failed ____my work in time .A.and finished B.to fonished C.and finishing D.t 英语翻译1、他喜爱文学,尤其经典作品.（in particular）2、在许多美国城市,在饭店内吸烟是违法的.（illegal）3、时间不多了,我们必须立即行动起来.（run out）4、他们俩在这件事情上意见相左. 1.If you go to the party tonight,______.A.so well he B.so he well C.so he dose D.so dose he 2.-Have you read this book?-Yes.I______it two weeks ago.A.is reading B.have read C.read D.willread1.A.so he will B.so he will 2.D.will read 抱歉啊 都能 1.__they dislike the lecture given by the professor,they shouldn't have made so much noise.A）even B)even so C)however D)however much 为什么不选C?2I wonder whether he knows __to write a book.A)how great pains it will cost B)how great pain it wi 新编大学英语3课后习翻译答案 英语翻译第三单元的 第二个 课后阅读 the pursuit of excellent 英语翻译 英语翻译 已知关于x的一元二次方程x^2+kx-3=01 求证无论K为任何实数,方程总有两个不相等实数根 2 当K=2时,用配方法解此方程 英语翻译他是我最喜欢的演员,我认为他最棒.He is ______ ______actor,I_____he is_______.瑞克经常和他父亲去看电影.Rick often _____ _____ _____ movies _____ his_______.Rick Smith His farorite actor is——————.______ 英语翻译 使得关于x的一元二次方程kx^2-2(3k-1)x+9k-1 的两根都是整数的所有实数k的值为 英语翻译 英语翻译 英语翻译 英语翻译