[tex] \dfrac{a}{b} = \dfrac{2}{3} \Longleftrightarrow 3a = 2b \Longrightarrow a = \dfrac{2b}{3} [/tex]
[tex]4,5a = \dfrac{45 {}^{(5} }{10} \cdot \dfrac{2b}{3} = \dfrac{ \not9}{ \not2} \cdot \dfrac{ \not2b}{ \not3} = 3b[/tex]
[tex] \Longrightarrow [/tex] 4,5a - 3b = 3b - 3b = 0
Răspuns : a)
