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ShinToMooN
@ShinToMooN
May 2019
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J'ai besoin d'aide sur un exo de maths svp merci exo 24 j'aimerais les calculs svp merci beaucoup
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MonsieurFirdown
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Bonjour
♧ On note x la longueur AF d'où CF = (18-x)
♧ D'après le théorème de Thalès :
FB /FD = FA /FC = AB /CD
D'où
FB /FD= x /(18-x ) = 5,5 /0,5
♧ On a donc :
0,5x = 5,5×(18-x)
0,5x = 99 - 5,5
6x = 99
x = 99/6
x = 16,5 mm
Voilà ^^
1 votes
Thanks 1
ShinToMooN
Merci beaucoup :)))
MonsieurFirdown
^^
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Verified answer
Bonjour♧ On note x la longueur AF d'où CF = (18-x)
♧ D'après le théorème de Thalès :
FB /FD = FA /FC = AB /CD
D'où
FB /FD= x /(18-x ) = 5,5 /0,5
♧ On a donc :
0,5x = 5,5×(18-x)
0,5x = 99 - 5,5
6x = 99
x = 99/6
x = 16,5 mm
Voilà ^^