Răspuns:
Explicație pas cu pas:
[tex]a + b = \frac{2}{3}[/tex]
[tex]a = \frac{14}{27}[/tex]
b = ?
[tex]\frac{14}{27} + b = \frac{2}{3}[/tex]
Aducem la acelasi numitor comun
[tex]\frac{14}{27} + \frac{b*27}{27} = \frac{2*9}{3*9}[/tex]
[tex]\frac{14}{27} + \frac{27b}{27} = \frac{18}{27} | *27[/tex]
14 + 27b = 18
27b = 18 - 14
27b = 4
[tex]b = \frac{4}{27}[/tex]
