S9t9 miner

1. Excuse me, did you buy Apple 7 or 7plus??

2. 设正项等比数列{a_n}的公比为q，设正项等比数列{b_n}的公比为p，则数列{lga_n}是等差数列，公差为lgq，{lgb_n}是等差数列，公差为lgp．
故S_n =n?lga₁+

n(n?1)

2

?lgq，同理可得 T_n =n?lgb₁+

n(n?1)

2

?lgp．
又

Sn

Tn

＝

n

2n+1

=

lga1+ n?1 2 lgq

lgb1+ n?1 2 lgp

，
∴logb5a5=

lga5

lgb5

=

lga1+4lgq

lgb1+4lgp

=

S9

T9

=

9

19

，
故答案为

9

19

．

3. http://wenku..com/link?url=CxN2RCJPJ-zacK4l8X9zwes9t9znFiZzCeAEO1_2Gr4tBI8ieXa__m

4. Sn=a1*n + n*(n-1)/2*da
Tn=b1*n + n*(n-1)/2*db
lim (Sn/Tn) = lim 5/(2n+4) = 0
而lim(Sn/Tn) = (da/db) = 0 所以da=0公差为0
故an为常数数列
Sn/Tn = a1*n/(b1*n + n*(n-1)/2*db) = 5/(2n+4) = a1/(b1+(n-1)/2*db) = 5/ (2n+4) 成立
n=1有a1/b1 = 5/6;
n=2有a1/(b1+db/2) = 5/8;
假设a1=5*k， 有b1=6*k，db=4*k

有a2/b3=a1/(b1+2*db)=5/14

5. 由等差数列的性质和求和公式可得：

S9

T9

=

9(a1+a9) 2

9(b1+b9) 2

=

a1+a9

b1+b9

=

2a5

2b5

=

a5

b5

=

2×5

3×5+1

=

5

8

故答案为：

5

8

6. http://wenku..com/link?url=CxN2RCJPJ-zacK4l8X9zwes9t9znFiZzCeAEO1_ 2Gr4tBI8ieXa__ BM4Oyz0k_ I this is the property company out of the community notice model on the network to find, hope to help you.

7. Can I plug in another 2G memory mole to upgrade to 4G? It is equipped with GMA3100 integrated display, can you add independent graphics card This machine has only one memory slot. There is no room to upgrade the graphics card