Question

știind ca a/b=2/3, calculați 3a-b/a+b

Answer 1

[tex]\frac{a}{b}=\frac{2}{3}\Rightarrow \frac{a}{2}=\frac{b}{3}=k\Rightarrow a=2k,b=3k\\ \frac{3a-b}{a+b}=\frac{3\cdot2k-3k}{2k+3k}=\frac{6k-3k}{5k}=\frac{3k}{5k}=\frac{3}{5}[/tex]