$\dfrac{9}{8}$ $\times$ $\dfrac{7}{4}$ + $\dfrac{3}{3}$ $\times$ $\dfrac{9}{8}$ 

$\dfrac{9}{8}$ = $\dfrac{7}{4}$ + $\dfrac{3}{3}$ 

 = $\dfrac{11}{4}$ $\times$ $\dfrac{9}{8}$

= $\dfrac{99}{32}$

7 + $\dfrac{6}{3}$ -  $\dfrac{2}{3}$+ 7

7= $\dfrac{6}{3}$ -  $\dfrac{2}{3}$

=  $\dfrac{4}{3}$ + 7

=  $\dfrac{25}{3}$

$\textit{nhodauu}$