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Sagot :

(7-2x)²+(2+5x)(35-10x) = (7-2x)²+(2+5x)* 5(7-2x) =  (7-2x) ((7-2x)+(2+5x)* 5) = (7-2x)((7-2x)+(10+25x) = (7-2x)(17 +23x)

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