Foro 2
Foro 2
Foro 2
COMPAÑEROS,
ESTUDIANTE
PROFESOR
IBAGUÉ – COLOMBIA
:
PREGUNTAS DINAMIZADORAS
X + y + 2z = 1 1X
+ 2y – z = 13 2 3x –
2y + z = 3 3
X + 2Y – Z = 13
3X – 2Y + Z = 3
4X + 0 + 0 = 16 4
4X = 16
X = 16 / 4
X= 4
X + Y + 2z = 1 = 1(x + y + 2z = 1) = x + y + 2z = 1
X + 2y - z = 13 = 2(x +2y - z = 13) = 2x +4y - 2z = 26
3x +5y - 0 = 27 5
4x + 0 + 0 = 16 (Ecu 4) *- 3
3x + 5y + 0 = 27 (Ecu 5) * 4
= 0 + 20y + 0 = 60
20y = 60
Y = 60/ 20
Y= 3
Z = - 3x + 2y + 3
Z = -3(4) + 2(3) + 3
Z = -12 + 6 + 3
Z=-3
X = 4, Y = 3, Z = -3
2. RESUELVE EL SISTEMA DEL ENUNCIADO POR EL MÉTODO DE
CRAMER.
X + y + 2z = 1
X + 2y – z = 13
3x – 2y + z = 3
∣ ∣
1 1 2
1 2 −1
∆ S= 3 −2 1 ∆ =-5-15
1 1 2 S
1 2 −1
∆ S = -20
1 1 2
∣
13 2 −1
∣
3 −2 1
1 1 2
13 2 −1 ∆ x = -53-27
∆x
∆ x= -80
X= -80/-20
X= 4
∣ ∣
1 1 2
1 13 −1
∆ y=3 3 1 ∆ y= 16-76
1 1 2
1 13 −1
∆ y =- 60
Y=-60/-20
Y=3
∣ ∣
1 1 1
1 2 13
∆ z= 3 −2 3 ∆ z= (6-2+39)-(6-26+3)∆ z= 43+17
1 1 1
1 2 13
Det.z = 60 Z=60/-20 Z=3