he is a [doctor]题问

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• 问几道数学极限的题!分全给了!1 ,lim x→无穷 {1 + 1/2 + 1/4 + …1 / [2^(n -1)]} / {1 + 1/3 + 1/9 + …1 / [3^(n -1)]} 求它的极限!2 ,lim x→无穷 ( x + c)/ ( x - c ) =4 求c的值是多少 3 设函数f（x）在[0,1]且f（0）=1,f（1）=0 求证存在一点 q∈（0 ,1） 使得 f（q） =q .如何证明?q是克赛、 这个题好像是零点定理4,lim x→无穷 [ (2X+3)/ (2X+1 )]^（X+1） lim x→0正 X/ [根号(1-COS X )] lim x→1 x^[1/(1-X)]5,利用夹比准则证明 ：lim x→无穷 { 1/[根号（n^2 +1)] +1/[根号（n^2 +2)] +…+1/[根号（n^2 +n)] =1
• He is a doctor
• 用介词,副词填空1.What must i do___spring festival?2.you should point____people in some countries.3.we can not drop litter___the street 4.a child can not work____the age of twelve