Bonjour, svp je comprends rien :
a.
[tex] \frac{8}{?} \times \frac{?}{5} = \frac{56}{45} [/tex]

b.
[tex] \frac{?}{9} \times \frac{7}{?} = \frac{49}{81} [/tex]

c.
[tex]... \times \frac{7}{5} \times = \frac{28}{5} [/tex]
Aider moi je ne capte pas ​​
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