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Thynathcarves
@Thynathcarves
April 2019
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Deux nombres qui ont le meme carré sont-ils égaux? Démontre ta réponse
3 et -3 ont le meme carré mais ne sont égaux comment puis je le démontrer
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kvnmurty
A et b sont deux nombres reels.
a² = b²
√(a²) = +b ou -b
a = +b ou -b
b = +a ou -a
| a | = | b |
=========
3² = (-3)²
3 = -3 ou - (-3) --- la deuxieme est vrai.
donc, 3 = - (-3)
et | 3 | = | -3 |
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a² = b²
√(a²) = +b ou -b
a = +b ou -b
b = +a ou -a
| a | = | b |
=========
3² = (-3)²
3 = -3 ou - (-3) --- la deuxieme est vrai.
donc, 3 = - (-3)
et | 3 | = | -3 |