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fiche - Secondaire - De Boeck

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Exercice 4<br />

Indiquer la méthode la plus rapide pour résoudre les systèmes suivants.<br />

a.<br />

b.<br />

c.<br />

d.<br />

e.<br />

f.<br />

g.<br />

ìx<br />

=<br />

í<br />

ï 5<br />

î<br />

ï<br />

ï7x-<br />

6y= 5<br />

ì 5x+ 9y= 96<br />

í<br />

ï<br />

î<br />

ï<br />

ï-<br />

5x+ 6y= 114<br />

ì7x-<br />

2y= 33<br />

í<br />

ï<br />

î<br />

ï<br />

ï3x+<br />

6y= 37<br />

⎧5x+<br />

4y= −33<br />

⎨<br />

⎩x+<br />

y=<br />

−7<br />

⎧ 3 3<br />

⎪y=−<br />

x−<br />

⎨ 2 2<br />

⎩<br />

⎪y=<br />

x–<br />

4<br />

⎧7x+<br />

5y= 8<br />

⎨<br />

⎩7x+<br />

y=<br />

−32<br />

⎧ 6x+ 5y= 18<br />

⎨<br />

⎩−<br />

6x+ 5y= 42<br />

y= x<br />

y x<br />

− ⎧ 7 10<br />

+<br />

⎪ 6 6<br />

h.<br />

⎨<br />

⎪ 7<br />

=− + 4<br />

⎩⎪<br />

4<br />

Chapitre 5 : Systèmes d’équations<br />

<strong>fiche</strong><br />

20<br />

autocorrective<br />

© Groupe <strong>De</strong> <strong>Boeck</strong>, 2010

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