Răspunsuri

2014-07-05T13:13:38+03:00
(3x+2)/3 + (9+x)/9=5  aducem la acelasi numitor

9x+6+9+x=45

10x+15=45

10x=45-15

10x=30
x=3
2014-07-05T15:03:35+03:00
 \frac{3x+2}{3} +  \frac{9+x}{9} 
 =5

amplificam prima fractie cu 3 =>

 \frac{9x+6}{9} +  \frac{9+x}{9} =5

[tex] \frac{10x+15}{9} =5

10x+15=9*5

10x+15=45  /-15

10x=30    /:10

x=3
1 5 1