Sagot :
[tex] \frac{7}{9} ( 8 \frac{3}{7} + \frac{11}{14} ) \\ = \frac{7}{9} ( \frac{59}{7} + \frac{11}{14} ) \\ = \frac{7}{9} ( \frac{118 + 11}{14} ) \\ = \frac{7}{9} ( \frac{129}{14} ) \\ = \frac{43}{6} \: or \: 7 \frac{1}{6} [/tex]
[tex] \frac{7}{9} ( 8 \frac{3}{7} + \frac{11}{14} ) \\ = \frac{7}{9} ( \frac{59}{7} + \frac{11}{14} ) \\ = \frac{7}{9} ( \frac{118 + 11}{14} ) \\ = \frac{7}{9} ( \frac{129}{14} ) \\ = \frac{43}{6} \: or \: 7 \frac{1}{6} [/tex]