Question

se alguém poder me ajudar agradeço...

Answer 1

Regra de Cramer:

D =

[1 2 - 1 1 2]

[2 - 1 3 2 - 1]

[3 3 - 2 3 3]

D = 1.(-1).(-2) - 2.3.3 - 1.2.3 - [(-1).(-1).3 + 1.3.3 + 2.2.(-2)]

D = 2 - 18 - 6 - [3 + 9 - 8]

D = - 22 - (4)

D = - 26

Dx =

[2 2 - 1 2 2]

[9 - 1 3 9 - 1]

[3 3 - 2 3 3]

DX = 2.(-1).(-2) + 2.3.3 - 1.9.3 - [(-1).(-1).3 + 2.3.3 + 2.9.(-2)]

Dx = 4 + 18 - 27 - [3 + 18 - 36]

DX = - 5 - (-15)

DX = - 5 + 15

DX = 10

X = DX / d

X = 10/(-26)

x = - 10/26 (:2)/(:2)

X = - 5/13

Dy =

[1 2 - 1 1 2]

[2 9 3 2 9]

[3 3 - 2 3 3]

Dy = 1.9.(-2) + 2.3.3 - 1.2.3 - [ -1.9.3 + 1.3.3 + 2.2.(-2)]

Dy = - 18 + 18 - 6 - [-27 + 9 - 8]

Dy = - 6 - (-26)

Dy = - 6 + 26

Dy = 20

Y = dy/d

Y =20/(-26)

Y = - 20/26 (:2)/(:2)

Y = - 10/13

Dz =

[1 2 2 1 2]

[2 - 1 9 2 - 1]

[3 3 3 3 3]

Dz = 1.(-1).3 + 2.9.3 + 2.2.3 - [2.(-1).3 + 1.9.3 + 2.2.3]

Dz = - 3 + 54 + 12 - (-6 + 27 + 12)

Dz = 63 - (33)

Dz = 63 - 33

Dz = 30

Z = dz/d

Z = 30/(-26)

Z = - 30/26 (:2)/(:2)

Z = - 15/13