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Sagot :
2x - 4y + 1z = 11 ⇒ 2x - 4y + 1z = 11
1x + 2y + 3z = 9 ⇒ 1x + 2y + 3z = 9
3x + 5z = 12 1x - 2y - 2z = 2
1x - 2y - 2z = 2
2x - 4y + 1z = 11 -2x + 2y - 2z = -3
1x + 2y + 3z = 9 ⇒ 1x + 2y + 3z = 9 x - 4z = 1
3x + 5z = 12 ⇒ 3x + 5z = 12 x - 4z + 4z = 1 + 4z
-2x + 2y - 2z = -3 x = 1 + 4z
1 + 4z - 2y - 2z = 2
1 - 2y + 4z - 2z = 2
1 - 2y + 2z = 2
- 1 - 1
-2y + 2z = 1
-2y + 2z - 2z = 1 - 2z
-2y = 1 - 2z
-2 -2
y = -0.5 + z
x + 2(-0.5 + z) - 2z = 2
x - 1 + z - 2z + 2 = 2
x - 1 + z = 2
+ 1 + 1
x + z = 3
x - x + z = 3 - x
z = 3 - x
1x + 2y + 3z = 9 ⇒ 1x + 2y + 3z = 9
3x + 5z = 12 1x - 2y - 2z = 2
1x - 2y - 2z = 2
2x - 4y + 1z = 11 -2x + 2y - 2z = -3
1x + 2y + 3z = 9 ⇒ 1x + 2y + 3z = 9 x - 4z = 1
3x + 5z = 12 ⇒ 3x + 5z = 12 x - 4z + 4z = 1 + 4z
-2x + 2y - 2z = -3 x = 1 + 4z
1 + 4z - 2y - 2z = 2
1 - 2y + 4z - 2z = 2
1 - 2y + 2z = 2
- 1 - 1
-2y + 2z = 1
-2y + 2z - 2z = 1 - 2z
-2y = 1 - 2z
-2 -2
y = -0.5 + z
x + 2(-0.5 + z) - 2z = 2
x - 1 + z - 2z + 2 = 2
x - 1 + z = 2
+ 1 + 1
x + z = 3
x - x + z = 3 - x
z = 3 - x
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