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Sagot :

Bonsoir,

a) (2x+4)*(2x-4)

= 4x² -8x +8x -16

= 4x² -16

b) (4*(2x*2x-8))/2

= (4 *( 4x²-8)) /2

(16x² -32)/2

= 2( 8x² -16)/2

= 8x² -16

= 8(x²-2)

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