Răspuns :
a/b=3/4 => a=3k; b=4k
[tex] \frac{3a+b}{2a-3b}[/tex] = [tex] \frac{3*3k+4k}{2*3k-3*4k} [/tex] = [tex] \frac{13k}{-6k} [/tex] = [tex] \frac{13}{-6} [/tex]
[tex] \frac{3a+b}{2a-3b}[/tex] = [tex] \frac{3*3k+4k}{2*3k-3*4k} [/tex] = [tex] \frac{13k}{-6k} [/tex] = [tex] \frac{13}{-6} [/tex]