二年级诵读视频

初二数学分式题：已知x-y-z=0,y-z=0,且xyz≠0.已知x-y-z=0,y-z=0,且xyz≠0.求 (1998x^2+1999y^2-2000z^2)／(1998x^2-1999y^2+2000z^2) 的值. 已知2cos∧2 a+3cos a sin a-3sin∧2 a=1,求:tan a,(2sin a-3cos a)\(asin a-9cos a)问题补充：分母是4sin a打错了 等腰三角形的判定证明题,麻烦把过程写的具体点）P是等腰△ABC的底边BC上的一点,过P作AB、AC的平行线,交AC、AB于Q、R,证明：PQ+PR为定值.（什么叫定值?） X^6-X^5+20X^4-2=0怎么做,要有步骤题目错了,是X^6-X^5+20X^4-20=0等比数列(an)中,已知a6=-1/32,S4=5/8,求公比只要求出公比就给分,但要有步骤.-1/2答案貌似对了步骤,看清楚,答案我也知道 关于初一三角形的3题数学题.1、已知,△ABC中,周长为l,AB=5,BC:AC=3:2,求l的取值范围.2、三角形的三边,a,b,c满足a^+b^+c^=ab+bc+ca,试判定a,b,c 的关系.3、如图,在三角形ABC中,N是AC的中点,AM=MC ,三角形ABM的 百分之20x=0.6-x 朝鲜族主要分布于我国的什么地区 她今天滑冰滑了多长时间了?How long ＿ ＿ ＿ skating today? I do not know how to plant a tree well .____________.A Neither does heB Neither he does C So does heI can not ____________anything________________this Channelregard them as your true friend and show your love to them__________________________________ （4）___they arrived early at the airport,they never missed the flight.A.If B Because C As soon as D Although我选的是B 标答是A 请问为什么 啊啊啊啊.初三怎样缓解压力啊? 已知函数f(x)={x²-4,0≤x≤2;2x,x>2,则f(2)=?'若f(x0)=8,则x0=? 设函数f(x)={x²+2 ,x≤2 {2x,x>2 ,若f(x0)=8,求x0的值X0的0是在右下角的 朝鲜族主要生活在我国的哪些地区他们有哪些特点 如何用计算机计锐角三角函数 朝字怎么组词 朝字组词 朝可以组哪些词 f(x)=x²-2x,g(x)=ax+2(a＞0),对任意x1∈[-1,2],存在x0∈【-1,2】,使g（x1）=f（x0）,求a的取值范围我的做法是任意先考虑,为何不对呢? chao二声 朝 能组什么词 回答, 要回答原因的喔 回答几个超简单的初三英语```根据提示填单词```1.sports are some of the ___you can do after school.2.my friend played the violin at a ___.3.a game with a net and a white ball(说一个符合的单词）4.we all ___ food to eat.5.I eat 初三英语速度回答1.I go there （because my parents are there）?对划线部分提问＿ ＿ you ＿ ＿?2.The fine art museum is both beautiful and interesting.（改为同义句）The fine are museum is ＿ ＿ beautiful＿ ＿ interesting3 1、The villagers ___home until the sun seta went b gose c didn`t go d doesn`t go 2、my son doesn`t do well at school.That `s why I ___to see you .a have come b come c came d will come 这两题的答案是什么?为什么?第二题的答案是a 为 朝鲜族分布在哪里 设函数f（x）=2x-3,x≥1 x²-2x-2,x＜1,若f（x0）=1,则x0等于 朝能组什么词? His action a heated argument.A set out B set up C set off D set free 初三英语 求详解English teachers often encourage the students _______ English aloud. A. read B. reading C. to read D. readed10. My hobby is ______all kinds of coins.A. to collect B. collecting C. to pick up D. picking up12. My postcar 硫酸铜是农药么?是么, 为什么硫酸铜可以制取农药?