2.The arithmetic (Arithmetic Sequence or Arithmetic Progression) is the largest, with the difference between the image with any word on the previous is constant. Such constant called the common difference (Common Difference), denoted by D.With the A.P.
number arithmetic in the form of general as follows:
a a D,,,, a 2D a 3D...
to term n by formula Tn = a (n - 1) d
the foreign joint. Is d = T2 - T1 = T3 - T2 =... = Tn - Tn-1
example 1 seek Tn of - 5 - 1,,,, 3 7...
D = - 1 - (- 5) = 3 - (- 1) = 7 - 3. 4
from formula Tn = a (n - 1) d
.= - 5 (n - 1) (4)
-
= 4N 9 sample 2 find number arithmetic with Tn = 2n 4
T1 = 2 (1) 4 = 6
T2 = 2 (2) 4 = 8
. T3 = 2 (3) 4 = 10
T4 = 2 (4) 4 = 12
number arithmetic is 6 8 10,,,, 12...
การแปล กรุณารอสักครู่..
