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aureliagrasset
@aureliagrasset
January 2021
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Voilaa l'exercice merci de maider.
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nonotata
Bonsoir
a =x²-2x+1+x²+x²+2x+1
a = 3x²+2
2/
(x-1)²+x²+(x+1)² = 1325
3x²+2 =1325
3x² = 1325-2
3x² =1323
x² = 1323/3
x² = 441
x =V441
x = 21
x-1 = 21-1 = 20
x = 21
x+1 = 21+1 =22
les 3chiffres sont donc 20 21 et 22
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a =x²-2x+1+x²+x²+2x+1
a = 3x²+2
2/
(x-1)²+x²+(x+1)² = 1325
3x²+2 =1325
3x² = 1325-2
3x² =1323
x² = 1323/3
x² = 441
x =V441
x = 21
x-1 = 21-1 = 20
x = 21
x+1 = 21+1 =22
les 3chiffres sont donc 20 21 et 22