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Sagot :

Bsr

= x²+(x+5)(x²+9x+30)-25

= (x-5)(x+5)+(x+5)(x²+9x+30)

= (x+5)(x-5+x²+9x+30)

= (x+5)(10x-5+x²+30)

= (x+5)(10x+25+x²)

= (x+5)(x²+10x+25)

= (x+5)³

Voilà !

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