Question

Aflati x din proportia
x+1/3x-1=1/2
Ajutor va rog

Answer 1

$\it If\ \dfrac{x+1}{3x-1}=\dfrac{1}{2} ,\ then\ 2(x+1) =3x-1 \Longrightarrow 2x+2=3x-1 \Longrightarrow\\ \\ \\ \Longrightarrow2+1=3x-2x \Longrightarrow 3=x \Longrightarrow x=3$

Answer 2

( x + 1 ) / ( 3 x - 1 ) = 1 / 2

→ produsul mezilor = produsul extremilor

3 x - 1 = 2 ( x + 1 )

3 x - 1 = 2 x + 2

3 x - 2 x = 2 + 1

x = 3