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justiine974
@justiine974
January 2021
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Bonjour j'ai un devoir a faire et je n'arrive pas à trouver les réponses 3-4-5 vous pouvez m'aidez svp ???
aidez moi svp je comprend pas !!!!
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scoladan
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Bonjour,
3) LC^2 = (c/2 - xc)^2 + yc^2 = xc^2 + yc^2 + c^2/4 - cxc
4) a^2 = (c - xc)^2 + yc^2 = xc^2 + yc^2 + c^2 - 2cxc = b^2 + c^2 - 2cxc
b^2 = xc^2 + yc^2
5) on remplace dans L^2 :
xc^2 + yc^2 par b^2
et cxc par (-a^2 + b^2 + c^2)/2
L^2 = b^2 + c^2/4 + a^2/2 - b^2/2 - c^2/2 = b^2/2 + a^2/2 - c^2/4 = 1/4 (2b^2 + 2a^2 - c^2)
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Bonjour,3) LC^2 = (c/2 - xc)^2 + yc^2 = xc^2 + yc^2 + c^2/4 - cxc
4) a^2 = (c - xc)^2 + yc^2 = xc^2 + yc^2 + c^2 - 2cxc = b^2 + c^2 - 2cxc
b^2 = xc^2 + yc^2
5) on remplace dans L^2 :
xc^2 + yc^2 par b^2
et cxc par (-a^2 + b^2 + c^2)/2
L^2 = b^2 + c^2/4 + a^2/2 - b^2/2 - c^2/2 = b^2/2 + a^2/2 - c^2/4 = 1/4 (2b^2 + 2a^2 - c^2)