Question

determine a razão dessa p.a (2x,-1, 2x+3, 5x+1)

Answer 1

a1 = 2x - 1
a2 = 2x + 3
a3 = 5x + 1

propriedades
( a1  +  a3 ) = 2 ( a2)
( 2x - 1) + ( 5x + 1) = 2 ( 2x + 3)
7x = 4x + 6
7x - 4x = 6
3x = 6
x = 6/3 = 2 *****
2x - 1 = 2(2) - 1 = 3 ***
2x + 3 = 2(2) + 3 = 7***
5x + 1 = 5(2) + 1 = 11***

r = 7 - 3 = 4 ***