Question

Rezolva ecuatiile:
3x-11=4x
2.6x+1=8,8
3x-7=x-1pe3

Answer 1

Exericitul 1
[tex]3x-11=4x 3x-11-4x=0 -x-11=0 -x=11/(-1) x=-11 [/tex]

Exercitiul 2
[tex]2,6x+1=8,8 2,6x=8,8-1 2,6x=7,8 [/tex]

$x= \frac{7,8}{2,6}= \frac{ \frac{78}{10} }{ \frac{26}{10} }= \frac{78}{10} * \frac{10}{26}= \frac{78}{26}=3$

La ultimul exercitiu faci produsul mezilor = cu produsul extremilor

$3x-7= \frac{x-1}{3}$

Aducem la acelasi numitor comun cu 3!

3(3x-7)=x-1

9x-21=x-1

9x-21-x+1=0

8x-20=0

8x=20

x=20/8=10/4= 5/2