【简答题】已知数列{a n }为公差不为零的等差数列,a 1 =1,各项均为正数的等比数列{b n }的第1项、第3项、第5项分别是a 1 、a 3 、a 21 . (1)求数列{a n }与{b n }的通项公式; (2)求数列{a n b n }的前n项和S n .
【简答题】已知等差数列{a n }的首项a 1 =1,公差d>0,且第2项、第5项、第14项分别为等比数列{b n }的第2项、第3项、第4项. (1)求数列{a n },{b n }的通项公式; (2)设数列{c n }对n∈N * ,均有 + +…+ =a n +1 成立,求c 1 +c 2 +c 3 +…+c 2014 的值.
【简答题】阅读下面的程序: Private Sub Form_Click() Dim Check As Boolean, Counter As Integer Check = True Counter = 5 Do Do While Counter < 20 Counter=Counter + 1 If Counter=10 Then Check=False Exit Do End If Loo...
【单选题】阅读下面的程序,程序的运行结果为() t a=10,b=4,c=20,d=6; label1.Text=a++*b+c*--d;
【简答题】Listen to the extract from The Last Leaf and fill in the blanks. “I have something to tell you, white mouse,” she said. “Mister Behrman ______ pneumonia today in the hospital. He was sick only two day...
【单选题】阅读下面的程序: Option Base lPrivate Sub swapa0 As IntegerFori_1t010,2t=a(i)a(i)=a(l0一i+1)a(10-i+1)=tNextiEnd SubPrivate Sub Form. Click0Dimx00)AsIntegerFori=l t010x(i)=*2NextiSwapx0Fori=l to 10Debug.Printx(...
B.
2 4 6 8 10 12 14 16 18 20
C.
20 18 16 14 12 10 8 6 4 2
【简答题】(本小题满分12分) 已知数列{ }为公差不为零的等差数列, =1,各项均为正数的等比数列{ }的第1 项、第3项、第5项分别是 、 、 . (I )求数列{ }与{ }的通项公式; (Ⅱ)求数列{ }的前 项和.
【简答题】翻译: 1. Lot's wife 2.Curious as Lot's wife,he enjoys prying into other people's secrets and is therefore generally disliked. 3. dove and olive leaf 4. They are flying flags of dove and olive leaf inste...
【简答题】阅读下面的程序,回答问题。 import java.awt.*; import javax.swing.*; public class T extends JFrame { public T ( ) { super("GridLayout"); Container con=this.getContentPane(); con.setLayout(new GridLayout(2,3)); con....