已知不等式ax的平方+bx+c

已知tana=2分之1,求tan2a,cot2a 若方程x^2/2a+y^2/a^2=1表示焦点在y轴上的椭圆,则实数a的取值范围是 若函数f(x)=loga(x²-ax+5)(a>且a≠1)满足对任意的x1,x2,当x1 若函数f(x)=loga(x2-ax+3)(a>0且a≠1),满足对任意的x1,x2,当x1 英语翻译This installation disc isn’t compatible with your version of Windows.To upgrade,you need the correct installation disc.For more information,check your computer’s system information.To install a new copy of Windows,restart (boot) your 请问括号里填什么 英语翻译How shall we choose our books?Which are the best,the eternal,indispensable books?To all to whom reading is something more than a refined idleness these questions recur,bringing with them the sense of bewilderment; and a still,small voice A scientist who does research in economic psychology and who wants to predict the way in which consumers will spend their money must study consumer behavior.He must obtain data both on the resources of consumers and on the motives that tend to encour 英语翻译The facility here in the southwestern port city of Yeosu,455 kilometers from Seoul,is the first of three to be built in the country under the so-called Oil-Hub Korea project.The Yeosu facility currently has 36 tanks that can store up to 8 60和62~\(≧▽≦)/~ f（x）=loga[loga（logaX）]的定义域（a是底数） 方程x²/3-y²/sin（2α+π/4）=1表示椭圆,则α的取值范围是多少? f(x)=logax x的定义域 方程x^2 sinθ+y^2 sin2θ=1表示焦点在x轴上的椭圆,则θ的取值范围是 方程x²sinθ+y²sin2θ=1 表示椭圆,则θ 的取值范围是 什么(动词)成绩 括号里填动词. 汽车镀膜起到的是什么作用呢? 汽车镀膜起什么作用的呢? 万凰之王结局是什么意思,萱萱到底是飞走了还是继续留在了宫中呢. 一定要非常详细.别废话, 2012年考研数学三《高等数学》同济大学 第六版下册 第8章“空间解析几何与向量代数”考吗! 求历年四级真题求最近几次的四级真题（至少三份）发到我的邮箱buaacaozhen@163.com谢谢 第二步是怎么变出来的? 一道高中函数题的答案,请问怎么从第一步变到第二步? 第一步怎么变到第二步的? 苹果的英文名字叫什么 英语翻译Sand replacement does not prevent erosion forever,but it temporarily restores the beaches with sand from the ocean floor. 对老公的英文昵称想在电话本里头给老公起一个英文名称,比如honey之类的, 英语翻译 英语翻译 忧郁萱萱代表什么生肖 忧郁萱萱指什么动物