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Sagot :

[tex] = ( \frac{9}{7} - 5)(9 \times \frac{9}{7} - 7) = ( \frac{9}{7} - \frac{35}{7} )( \frac{81}{7} - \frac{49}{7} ) = ( \frac{9 - 35}{7} )( \frac{81 - 49}{7} ) = \frac{ - 26}{7} \times \frac{32}{7} = \frac{ - 832}{49} [/tex]

bonne continuation

MITCHALEXANDRINE2314

A= (x-5)(9x-7)

=(9/7-5)(9×9/7)-7)

=(9/7-5)(81/7-7)

=(9/7×81/7)-(9/7×7)-(5×81/7)+(5×7)

=729/49-9-405/7+35

=-832/49

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