证明limn√n1

当焦点在x轴时,椭圆的标准方程是：x^2/a^2+y^2/b^2=1,(a>b>0)； 当焦点在y轴时,椭圆的标准方程是：y^2/a^2+x^2/b^2=1,(a>b>0)；2个方程当中的a,b是表示长轴和短轴还是长半轴和短半轴 The USA lies on the other side of—— A Pacific B Pacific Ocean C The Pacific D the Ocean Pacific今天这是第几次蛋疼了. 赛车的外侧与内侧车轮相距两米,当赛车绕圆形跑道跑一圈时,外则车轮比内侧多走了多远?我知道是2*2*π=12.56,但怎么来的呀,不然明天老师hold不住要K我了重赏 The United States of America is in the n ___ The United States of America is in the n ___part of America.It has an area of 9,372,256square k ___.Its c ___is Washington D.C.It has f___states.It has a p___ of 266,578,000.Its native l___is English,with 首字母填空 The d.of America is very important in history Which state of America is in the Pacific Ocean?Which country is to the north of the America? 根据首字母填空 It is reported that t___ of people were killed or injurd in the hurricane in AmericaThough the high school entrance exam is coming ,you should r___ yourselfChina held the 2008 Olypic Games s_____She p___ walking to the factory t los Angeles/America/west/in/of/the/is连词成句 已知函数f(x)=Asin(ωx+φ),x∈R(之中A>0,ω>0,0 已知函数f(x)=Asin(wx+b)+k,x∈R(其中A>0,W>0,0 已知函数F(X)=Asin(ωx+ψ)(其中A>0,ω>0,0 函数f(x)=Asin(ωx+Φ)+b的部分图像如图,则S=f(0)+f(1)+f(2)+...+f(2011)= The British Isles＿＿of a group of islands that lies off the west coast of Europe .为什么选is consisted呢?这是我们期中考试的卷子。而且答案就是is consisted没错！ The British Isles are a group of islands that lies off the west coast of Europe是什么意思 The British Isles is a group of islands that lies ________ the west coast of Europe.(Unit5-8)A.in?B.on?C.from?D.off为什么选D不选其它?其它选项用在这里又是什么意思呢?请分析一下英语中关于方位的相关语法. x-(0.4x-33)+143=(1+0.15)x 1.4X*0.8=X+15 X=多少?快 (x^2-4x)^2-2(x^2-4x)-15 4x(x+1)=15 多项式:2010a的m次方b+2009的x次方乘y的4次方-2010x的n-1次方乘y的2n－4次方＋2009a的2m次方乘b的3n次方【其中mn为正整数】恰好有两项是同类项,化简为? 若a的2次方+a+1=0,求a的2009次方+a的2010次方+a的2010次方 Which state is round at both sides and high in the middle inU.S.美国哪个洲是两头圆,中间高?脑筋急转弯 which of the following is not a state of the united states?A new york B hawaii C california D los angles which is the capital of USA A.washington D.C.B.new york .C.los angeles .D.atlanta . Which is the capital city of the USA? 初一下册取绝对值计算题：根号三+1+3+|1-根号三|怎么做?这种计算题的定义是什么? x（33-2x+2）=150, 解得：x1=10,x2=7.5,怎么算的?详细点. (ax-1)^5=ax^5+bx^4+cx^3+dx^2+ex+f,如何用杨辉三角解 初二分组分解法分解因式 .（1） 5（x-y)立方+10(y-x)平方（2）18ab（a-b）平方-12（a-b）立方（3）2a（x-a）+4b（a-x）-6c（x-a） 初中二年级数学问题(分组分解法)应该很简单运用分组分解法 X~3指X的立方啊:(1) X~3-7~2-4X+28 (2)X~3Y-XY (3)a~4+a~2+a+1有追加悬赏 （上） 分解因式 【分组分组分解法 要全面啊分解因式的要点也说下!