fiche - Secondaire - De Boeck
fiche - Secondaire - De Boeck
fiche - Secondaire - De Boeck
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12.<br />
13.<br />
Résoudre les systèmes suivants<br />
Série 1<br />
a. x ⎧ = 3<br />
⎨<br />
⎩4x+<br />
y = 16<br />
b.<br />
a.<br />
b.<br />
a.<br />
b.<br />
⎧x<br />
= y<br />
⎨<br />
⎩x+<br />
y = 32<br />
Série 2<br />
⎧3x+<br />
2y = 14<br />
⎨<br />
⎩5x−<br />
2y = 18<br />
⎧x+<br />
y = 3<br />
⎨<br />
⎩3x−<br />
y = 1<br />
Série 3<br />
⎧ x y<br />
+ = 1<br />
⎪ 3 4<br />
⎨<br />
⎪ x y<br />
+ = −1<br />
⎩⎪<br />
4 3<br />
⎧ x<br />
+ y = 19<br />
⎪ 3<br />
⎨<br />
⎪ x y<br />
+ = 7<br />
⎩⎪<br />
3 5<br />
c.<br />
c.<br />
d.<br />
c.<br />
d.<br />
d.<br />
⎧x+<br />
y = 12<br />
⎨<br />
⎩x−<br />
y = 4<br />
⎧x−<br />
2y = 20<br />
⎨<br />
⎩y<br />
= 8<br />
⎧5x−<br />
4y = −6<br />
⎨<br />
⎩2x−<br />
4y = 0<br />
⎧10a−<br />
b = −2<br />
⎨<br />
⎩10a−<br />
4b = 7<br />
⎧8x−<br />
6y = −36<br />
⎪<br />
⎨2x<br />
− 2y= 0<br />
⎩<br />
⎪<br />
3<br />
⎧ 3y<br />
x + = 17<br />
⎪ 7<br />
⎨<br />
⎪ 5x<br />
y − = 6<br />
⎩⎪<br />
8<br />
Impossibles ou indéterminés ?<br />
e.<br />
f.<br />
e.<br />
f.<br />
e.<br />
f.<br />
⎧−<br />
x+ y = 40<br />
⎨<br />
⎩x+<br />
y = 20<br />
⎧2x+<br />
3y = 12<br />
⎨<br />
⎩x+<br />
y = 5<br />
⎧s−<br />
6p = −18<br />
⎨<br />
⎩3s−<br />
6p = −24<br />
⎧03<br />
, x+ 02 , y = 04 ,<br />
⎨<br />
⎩4x+<br />
2y = 7<br />
⎧ x− 1 y−2<br />
+ = 2<br />
⎪ 8 5<br />
⎨<br />
⎪ 2y− 5<br />
2x<br />
+ = 21<br />
⎩⎪<br />
3<br />
4x+ 153y−<br />
5<br />
− = x<br />
3 5<br />
2y+ 3x<br />
y 15<br />
+ y<br />
4 5<br />
+<br />
⎧<br />
⎪<br />
⎨<br />
⎪<br />
=<br />
⎩⎪<br />
Parmi les exercices suivants, préciser ceux qui sont impossibles et<br />
ceux qui sont indéterminés.<br />
a.<br />
b.<br />
⎧x−<br />
2y = 3<br />
⎨<br />
⎩3x−<br />
6y = 9<br />
⎧x−<br />
y = 0<br />
⎨<br />
⎩4x<br />
= 4y+ 9<br />
c.<br />
2 5<br />
3 3 1<br />
⎧ ( x+ y)<br />
=<br />
⎪<br />
⎨ x y<br />
⎪ + =<br />
⎩<br />
⎧4x−<br />
3y = 11<br />
d. ⎨<br />
⎩8x−<br />
6y = 22<br />
e.<br />
f.<br />
⎧7x−<br />
5 = 6y+ 3<br />
⎨<br />
⎩y+<br />
7x = 7y+ 12<br />
⎧x−<br />
2y = 3<br />
⎨<br />
⎩−<br />
3x+ 6y = 2<br />
Exercices<br />
79