There are several ways to find the general term formula of sequence

There are several ways to find the general term formula of sequence

Observation method, formula method (an = S1 (n = 1) an = SN-S (n-1) n ≥ 2), the form of accumulation suitable for a (n + 1) = an + FN, the form of accumulation suitable for a (n + 1) = anfn, and some results obtained from recurrence formula

Known quantity 1,3,5,7 The general formula of is___

2n-1

High two mathematics vector topic! Online and so on
Given the point a (1,0,1) B (4,4,6) C (2,2,3) d (10,14,17), it is proved that a, B, C and D are in the same plane

If we prove that the points are in the same plane, we only need to prove that the vectors containing these points are in the same plane. If we prove that the vectors are in the same plane, we only need to prove that one vector can be represented by the sum of other vectors
It is proved that ab = (3,4,5), AC = (1,2,2), CD = (8,12,14)
Let AAB + BAC = CD
Then 3A + B = 8
4a+2b=12
5a+2b=14
We can get a = 2, B = 2
The AB vector, AC vector and CD vector are in the same plane
So a, B, C, D are all in the same plane

In the triangle ABC, the vector ar = 2, the vector Rb, the vector CP = 2, the vector pr. if the vector AP = m times the vector AB + n times the vector AC, then M + n =?
It shouldn't be difficult
Draw your own graphics It's just a triangle I don't have any figures on this paper

What about graphics
Vector AP = vector Ar + vector RP
=2 / 3 vector AB + 1 / 3 vector RC
=2 / 3 vector AB + 1 / 3 (vector AC vector AR)
=2 / 3 vector AB + 1 / 3 (vector AC-2 / 3 vector AB)
=4 / 9 vector AB + 1 / 3 vector AC
M+N=4/9+1/3=7/9