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Maximims
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June 2021
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Bonsoir je bloque sur ceci :
Résoudre ces deux systèmes:
1) {z+z'=2
{z*z'=17
2) {z+z'=5
{z*z'=6,5
Niveau terminale S, merci d'avance :)
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caylus
caylus
Bonsoir,
1) z+z'=2=>z'=2-z (1)
z*z'=17 et (1) => z*(2-z)=17 => z²-2z+17=0
Δ=4-4*17=-64=(8i)²
z1=(2+8i)/2=1+4i
z2=1-4i
Vérifications:
z1+z2=2
z1*z2=(1+4i)*(1-4i)=1-16i²=17
2)
z+z'=5
z*z'=13/2
par un même raisonnement:
z1=(5+i)/2
z2=(5-i)/2
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Maximims
June 2021 | 0 Respostas
C'est important svp! 20 points ! Merci d'avance !
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Maximims
June 2021 | 0 Respostas
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