【简答题】已知点M(a,-1)和N(2,b)。 (1)当点M、N关于( )对称时,a=2,b=1; (2)当点M、N关于原点对称时,a=( ),b=( )。
【简答题】设数列{ n }满足 1 = , n+1 = n 2 + 1 , . (Ⅰ)当 ∈(-∞,-2)时,求证: M; (Ⅱ)当 ∈(0, ]时,求证: ∈M; (Ⅲ)当 ∈( ,+∞)时,判断元素 与集合M的关系,并证明你的结论.
【简答题】已知 f(n)=1+ 1 2 + 1 3 +…+ 1 n ,n∈ n * ,求证: (1)当m<n(m∈N * )时, f(n)-f(m)> n-m n ; (2)当n>1时, f( 2 n )> n+2 2 ; (3)对于任意给定的正数M,总能找到一个N 0 ,使得当n>N 0 时,有f(n)>M.
【单选题】实习期间请事假 /病假/丧假累计超过( )天的应当补实习,补实习的费用由( )承担,实习期间安全自负。
【单选题】实习期间请事假 / 病假 / 丧假累计超过( )天的应当补实习,补实习的费用由( )承担,实习期间安全自负。( )
【单选题】Lab Rat is a computer application
A.
for science experts to ask and discuss scientific questions.
B.
for science experts to show how experiments are done.
C.
for children to show off their knowledge about scientific questions.
D.
for children to enquire answers about scientific questions.
【简答题】关于直线 m 、 n 和平面 a 、 b 有个命题: ①当 m ∥ a , n ∥ b , a ∥ b 时, m ∥ n ②当 m ∥ n , m Ì a , n ⊥ b 时, a ⊥ b ③当 a ∩ b = m , m ∥ n 时, n ∥ a 且 n ∥ b ④当 m ⊥ n , a ∩ b = m 时, n ⊥ a 或 n ⊥ b , 其中假命题的序号是 。
【简答题】Translation :经理拒绝支持我们的提议。
【单选题】" In China it is relatively usual to ask people their age, but in the West this question is generally regarded as impolite. This is particularly true 56 women, and even more 57 if the inquirer is a ma...
【简答题】设数列{a n }满足a 1 =a,a n+1 =a n 2 +a 1 ,M={a∈R|n∈N*,|a n |≤2}, (Ⅰ)当a∈(-∞,-2)时,求证:a M; (Ⅱ)当a∈(0, ]时,求证:a∈M; (Ⅲ)当a∈( ,+∞)时,判断元素a与集合M的关系,并证明你的结论。