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CORRECTION DES EXERCICES D'APPLICATION DU PGCD

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665 = 35 x 19 = 19 Fraction irréductible<br />

1295 35 x 37 37<br />

B ) <strong>PGCD</strong> (783 ; 1595 ) = 29.<br />

Or 783 = 29 x 27 et 1595 = 29 x 55 donc :<br />

783 = 29 x 27 = 27 Fraction irréductible<br />

1595 29 x 55 55<br />

C ) <strong>PGCD</strong> (44 ; 235 ) = 1 donc cette fraction est déjà irréductible .<br />

D) <strong>PGCD</strong> (230 ; 253 ) = 23 .<br />

Or 230 = 23 x 10 et 253 = 23 x 11 donc :<br />

230 = 23 x 10 = 10 Fraction irréductible<br />

253 23 x 11 11<br />

E ) <strong>PGCD</strong> (720 ; 540 ) = 180 .<br />

Or 720 = 180 x 4 et 540 = 180 x 3 donc :<br />

720 = 180 x 4 = 4 Fraction irréductible<br />

540 180 x 3 3<br />

F ) <strong>PGCD</strong> (240 ; 432 ) = 48 .<br />

Or 240 = 48 x 5 et 432 = 48 x 9 donc :<br />

240 = 48 x 5 = 5 Fraction irréductible<br />

432 48 x 9 9

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