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28(x-8)=20(x-4) 这条方程怎么解?28(x-8)=20(x-4) 已知方程x/0.8=4与方程m+x=20的解相同,你能再写出一个与这两个方程的解相同的方程吗? 急!5分~英语题目!Hi, is Mary there, please?— _________ A. Hold on. I’ll get her. B. No, she isn’t here. C. Yes, she lives here. D. Yes, what do you want? 设集合A X大于负一小于2 B集合：4PX加一小于0,试判断AB之间是否存在某种包含关系?若存在,求出P的取值范围,并指明对应的包含关系,若不存在,请说明理由 设x∈[0,π）,则方程2sin2x=1的解集是___________就是还想问问一般性这类题目是如何解答的? |(5n/n+1)-5|n属于正整数 不等式k(x+3)>3x+4与2x-1 若a>0,c 求解一道英语题,给五分1.将汉语译为英语 我想当篮球运动员 译为 I want ( ) ( ) a basketball player2.用适当的介词填空The girl ( ) green is my friend.What do you often do ( ) weekends?Who do you play sports ( Let's( )home and ( )TV A:stay at;to B:to stay;to watch C:stay;watching D:stay at;watchI don't have( )erasers.Ithink Ann has ( ).A:any;any B:some;any C:some;some D:any;someDoes Tom( ）to do No,he doesn'tCai Yilin will give a singing performance( ) A: 解几道高中数学题http://zhidao.baidu.com/question/234360587.html 已知：奇函数y=f(x),x∈(-1,1),在(-1,1)上是减函数,解不等式f(1-x)+f(1-3x) 已知奇函数y=f(x),x属于（-1,1）在（-1,1）上是减函数,解不等式f(1-x)+f(1-3x)0 已知奇函数y=f(x) 且x∈（-1,1）,并且f（x）在（-1,1）上是减函数,解不等式f（1-x）+f（1-3x）＜0谢谢 已知y=f（x）,x在（-1,1）上既是奇函数有是减函数,解不等式f（1—x）+f（1+x*x） 设函数f(x)的图像关于y轴对称,又已知f(x)在(0,+∞)上为减函数,且f(1)=0,则不等式（f(-x)+f(x))/x＜0的解函数f(x)的图像关于y轴对称,又已知f(x)在(0,+∞)上为减函数,且f(1)=0,则不等式（f(-x)+f(x))/x＜0的 It is hard work to learn English.(换种表达保持句意不变）It is____ ____ ____to learn English. 设f（x）为奇函数,且在（负无穷.0）内是减函数,f（-3）=0,则不等式xf（x）＜0的解集为多少 设f（x）为奇函数,且在（-∞,0）内是减函数,f（-3）=0,则不等式xf（x）＜0的解集是什么 奇函数f(x)在(负无穷,0)为减函数,f(2)=0,求不等式xf(x)〉0的解集 设f(x)为奇函数,且在（-无穷大,0）内是减函数,f(-3)=0,则不等式xf(x) 1.已知函数f(x)=a-1/(2^x+1),若f(x)为奇函数,则a=( )2.已知函数f(x)是奇函数,已知x大于等于0时,f(x)=-2x^2+x+3.则当x a为三角形的内角,向量a=(cosa,sina),向量b=(根号3,-1）,|2a-b|=4,则a=( )(5π)\6 1,若数列 {an}为等差数列 ,m n p 是互不相等的正整数 ,则有（m-n）ap + （n-p）am + （p-m）an =0 ,类比上述性质 对等比数列{bn} 有什么性质2设F（n）=1/(n+1)+1/(n+2)+1/(n+3)+...+1/(n+n) ,则f(n+1)-f(n)=____3 数列1 （1）建筑一个容积为8100m^3,深9m的长方形蓄水池,池壁的造价为a元/m^2,池底的造价为2a元/m^2,问怎样设计水池能使总造价最低?（2）已知二次函数f(x)最小值为f(-1)=0,且f(0)=1求f(x)的解析式(3)y=(0.5)^x He has the bad habit of not washing his hands before meals.我想问一下为什么wash为什么要用ing? 1.Are you afraid of snakes and lions _____________________________________________ 2.Would you like to come to my party this evening?_____________________________________________ 3.Which is your favourite aninmal?_____________________________________ 你能稍我一程吗?Could you give me () () 完成句子,每空一词 题如下：四：Read the sentences from the passage .Say who or where the underlined words refer to1.so 【They】 flu different places foe their holiday.2His grandparents live 【there】 and he visits them every Spring Festival3【He】's written 用 used to do ,be used to do ,be used to doing 和括号内动词的适当形式填空.1.I ______ (read) English for half an hour every morning.2.There ______ (be) a quiet mountain village.3.Cloth can ______ (make) clothes.4.You ______ (go) to schoo 设奇函数f(x)在(0,+∞)上为减函数,且f(1)=0,则不等式(f(x)-f(-x))/x＜0的解集为? 奇函数f(x)在(0,正无穷)上是减函数,且f(-1)=0,则不等式f(x)/x>0的解集为答案是（-1,0）∪（0,1）,求详解