ma puteti ajuta?.....

Răspuns:
[tex]\frac{a}{b} =\frac{8}{9} = > a=\frac{8b}{9} \\\\\frac{7*\frac{8b}{9} }{6b} =\frac{\frac{56b}{9} }{6b} =\frac{56b}{9} *\frac{1}{6b} =\frac{56b}{54b} =(\frac{56}{54}) ^{2} =\frac{28}{27}\\\\raspuns-a[/tex]