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Superwoman12
@Superwoman12
April 2019
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Vérifier que pour tout nombre x : 1/2x²-2x=1/2x (x-4)
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mohayati2006
qlq soit x on a
1/2x²-2x=x(1/2 x-2)
=x (x-4)/2
=x/2 (x-4)
=(1/2)x (x-4)
0 votes
Thanks 1
mohayati2006
etudier signe de x -inf. - 0 + +inf. et signe de x-4 -Inf. - 4 + +inf
mohayati2006
1/2(x)(x-4) positif de )-inf, 0) U (4; +inf( il est negatif sur intervale )0,4(
mohayati2006
X -inf - 0 + + INFINI (X-4) inf - 0 - 4 + +INFIN 1/2x(x-4) + 0 - 0 + +infin
mohayati2006
X....-inf...........-....... -......... 0.................. +..............+..................... + INFINI (X-4).inf.......... -........-....... 0....... -....... 4.......................................... + +INFIN 1/2x(x-4) + 0 - 0 + +infin
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Lista de comentários
1/2x²-2x=x(1/2 x-2)
=x (x-4)/2
=x/2 (x-4)
=(1/2)x (x-4)