Question

sendo a p.a (5,x,19...) determine 9 valor de x​

Answer 1

Resposta:

x = 12

Explicação passo-a-passo:

b = (a + c) / 2 — fórmula do termo central de uma P.A.

a = 5

b = x

c = 19

x = (5+19)/2

x = 24/2

x = 12

Answer 2

$a_{1}=5\\a_{2}=x\\a_{3}=19$

$\mathsf{a_{2}-a_{1}=a_{3}-a_{2}}\\\mathsf{x-5=19-x}\\\mathsf{x+x=19+5}\\\mathsf{2x=24}$

$\mathsf{x=\dfrac{24}{2}}$

$\boxed{\boxed{\boxed{\mathsf{x=12}}}}$