Bonsoir pouvez-vous m'aider ,merçi:

-Développer les expressions : ( x-4)²;2(x+7)²et 5(x-  \frac{4}{5}

-compléter les égalités :x²-8x+=(x-4)²-;2x²+28x=2(x+7)²- et 5x²-8x=5(x-  \frac{4}{5} )²-
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