Bonsoir,
N =
[tex] \frac{ \frac{7}{2} }{5} \div \frac{5}{2} = \frac{3.5}{5} \times \frac{2}{5} = \frac{7}{25} [/tex]
P =
[tex] \frac{3}{ \frac{4}{9} } \div \frac{ \frac{1}{2} }{6} = 3 \times \frac{9}{4} \times \frac{6}{0.5} = \frac{27}{4} \times 12 = \frac{324}{4} = \frac{162}{2} = 81[/tex]
Voilà :)
