It is known that the sequence an is an equal ratio sequence whose common ratio is greater than one. For any n, it has a (n + 1) = a1 + A2 +... + a (n-1) + 5 / 2An + 1 / 2 (1) The general term formula of the sequence an (2) Let BN satisfy 1 / N (log3a1 + log3a2 +. + log3an + log3t) (n belongs to positive integer) If BN is an arithmetic sequence, find the value of real number T and the general term formula of BN

It is known that the sequence an is an equal ratio sequence whose common ratio is greater than one. For any n, it has a (n + 1) = a1 + A2 +... + a (n-1) + 5 / 2An + 1 / 2 (1) The general term formula of the sequence an (2) Let BN satisfy 1 / N (log3a1 + log3a2 +. + log3an + log3t) (n belongs to positive integer) If BN is an arithmetic sequence, find the value of real number T and the general term formula of BN

1)an= a1.q^(n-1)a(n+1)=a1+a2+...+a(n-1)+(5/2)an+1/2 (1)an=a1+a2+...+a(n-2)+(5/2)a(n-1)+1/2 (2)(1)-(2)a(n+1) - an = a(n-1) + (5/2)an - (5/2)a(n-1)a(n+1) = (7/2)an - (3/2)a(n-1)a1.q^n = a1.(7/2)q^(n-1) ...

Simple calculation of 1 / 29 * 3 / 8 + 6 / 29 * 1 / 12 + 3 / 29 * 1 / 9 (wait for the answer)

1/29*3/8+6/29*1/12+3/29*1/9
=1/29*3/8+1/29*6/12+1/29*3/9
=(1/29)(3/8+6/12+3/9)
=(1/29)(3/8+5/6)
=1/29*29/24
=1/24

How to decompose factor B2 + C2 + 2Ab + 2Ac + ABC
B2 + C2 + 2Ab + 2Ac + 2BC is this. It's wrong

b2+ c2+ 2ab+ 2ac+ 2bc=(b+c)2+2a(b+c)=(b+c)(2a+b+c)

62-63 = 1, move only one number to make the equation hold
You can only move numbers, not add or subtract
It's said that in our province, the time is within 10 minutes
It's 62-63 = 1, not - 1
Otherwise it wouldn't have been done by 100 people.

Move 6 to the upper right of 2 to become the exponent of 2, that is, the 6th power of 2 = 64, so 64-63 = 1

Let a be a symmetric positive definite matrix of order n, and prove that there exists a unique positive definite matrix B such that a = b * B

Orthogonal diagonalization: there are orthogonal matrices Q and diagonal matrices such that
Q'bq = D, q'aq = D ^ 2 = diag {E1, E2,..., en}, E1,..., en are the eigenvalues of A
Because B is also positive definite, d = diag {sqrt (E1),..., sqrt (EN)} is uniquely determined, then B is also uniquely determined, B = qdq '

For a two digit number, the number on the one digit is 4 less than the number on the ten digit number, and the sum of squares of the two digit number is 4 less than the two digit number, find the two digit number
We need to solve the quadratic equation with one variable

Is it the sum of squares of all the numbers? Let the number on the ten digits be x, then the number on the one digit be x-4 (x-4) &# 178; + X & # 178; = (10x + x-4) - 4x & # 178; - 8x + 16 + X & # 178; = 11x-82x & # 178; - 19x + 24 = 0 (X-8) (2x-3) = 0. The solution is: x = 8 or 3 / 2 ∵ the number must be an integer ∵ x = 8, x-4 = 4

What's the difference between determinant and square matrix in matrix?
I know the operation methods are different, but they are mainly based on linear equations. Why do we say determinant and square matrix are two completely different concepts

The determinant is a number. For example, the determinant of the unit matrix is a number 1
Matrix is a number table composed of many numbers, arranged in a certain order
Of course, different concepts

(1) the difference between 18.26 and X is equal to 3 times of 3.15. (2) 1.4 times of a certain number is 4.3 more than 6.9
Notice the equation!

(1) 18.26-x = 3.15 times 3
18.26-x=9.45
-x=9.45-18.26
-x=-8.81
x=8.81
(2) Let this number be X
1.4x-6.9=4.3
1.4x=11.2
x=8

Land desertification area change
Want data!

As for the question you mentioned, I think about it for you. I hope my sincere answer can get mutual respect
"Land desertification area change" has data to show (see China environment daily, 2007.145)
In 2003, the newly increased Gobi area was about 13075.3 square kilometers;
Since the implementation of seabuckthorn broad roadside action plan in 2004, the newly increased area is about 7545.57 square kilometers, which is lower than that in the same period of last year;
The data of 2005 is not accurate;
In 2006, according to the statistics of satellite remote sensing in 2007, the newly added area is still about 6500 square kilometers
The above answers, I hope to help you!

Xiao Ling read 15 pages of a story book on the first day, 21 pages on the second day, and 47 pages left. How many pages are there in this book?

(21 + 47) / (1-15) = 68 / 45, = 85 (page)