Sagot :
[tex]7-6( \frac{7}{5}+7)=7-6( \frac{7}{5}+\frac{35}{5})=7- 6\cdot \frac{42}{5}=7-\frac{252}{5}=7-50\frac{2}{5}=-43\frac{2}{5}[/tex]
[tex]7-6\cdot( \frac{7}{5} +7)=7-6\cdot7\cdot( \frac{1}{5}+1)=7-42\cdot \frac{6}{5} =7-50 \frac{2}{5} =-42 \frac{3}{5} [/tex]