【简答题】已知 ( x 2 - 1 2x ) n (n∈N * )的展开式中第四项的系数与第二项的系数的比是7:3. (Ⅰ)求展开式中各项系数的和; (Ⅱ)求展开式中常数项.
【单选题】已知( x - 2 x 2 ) n (n∈N * )的展开式中第5项的系数与第3项的系数的比是10:1,则展开式中含 x - 17 2 项是第( )
【单选题】若二项式(x+2) n 的展开式的第四项是 4 2 ,而第三项的二项式系数是14,则x的值为( )
【单选题】听力原文:W: Good morning, Sunshine Speedboat Company. What can I do for you! M: Good morning, can I speak to Nancy White? W: Ah, Jacques, nice talking to you again. How's the weather in your part of the w...
【简答题】若 ( 6 x + 1 6 x ) n 展开式中第二、三、四项的二项式系数成等差数列. (1)求n的值; (2)此展开式中是否有常数项,为什么?
【单选题】(1-2x) 展开式第四项的系数是( )
【单选题】Clerk:Good mornin9,Madam?Censumer:__________.I‘d like to open a savings account.
【单选题】—______. can you help me with my homework? — All right.
【单选题】患儿, 5个月。咳嗽,发热3天,气促1天。体温39°C,p160次/分,R60次/分,肺底部于吸气末闻及少许细湿啰音。肝右肋下1cm。诊断最可能为
【单选题】—Hi,Alice ! Good afternoon! —________.A. Hi; Good afternoon B. Thank you; Good mornin
A.
4.—Hi,Alice ! Good afternoon! —________. A. Hi; Good afternoon
B.
Thank you; Good morning