Question

aflati un numar fractionar stiind ca daca-l adunam cu 7 supra 9 obtinem 1 langa 2 supra 3

Answer 1

$x+\dfrac{7}{9}=1\dfrac{2}{3}\Rightarrow x+\dfrac{7}{9}=\dfrac{5}{3}\Rightarrow x=\dfrac{5}{3}-\dfrac{7}{9}=\dfrac{15}{9}-\dfrac{7}{9}=\dfrac{8}{9}$