Resolva os sistemas abaixo pelo metodo de escolamento.
B) X+y+z=9
3x+5y+6z=45
4x+8y+11z=76
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Respostas
Resposta:
X+y+z=9 = X= 9- (y) -z
3x+5y+6z = 45
3(9-y-z) + 5y +6z = 45
27 -3y -3z + 5y + 6z = 45
2y + 3z = 18
2y = 18 - 3z y = (18 -3z)/2
4x+8y+11z=76
4 (9- (18 -3z)/2) - z + 8 ((18 -3z)/2) + 11z = 76
36 - (72 - 12z)/2 - z + (144 - 24z)/2 + 11z = 76
36 - 36 - 6z -z + 72 - 12z + 11z = 76
- 8z = 4
z = 4/-8
z = - 1/2
X= 9- (18 -3(- 1/2))/2) -(- 1/2)
X = 9 - (18 - 3/2)/2 + 1/2
X = 9 - ((36 - 3)/2)/2 + 1/2
X = 9 - (33/2)/2 + 1/2
X = 9 - 33/4 + 1/2
X = (36 - 33 + 2)/4
X = 5/4
y = (18 -3z)/2
y = ((18 - 3(-1/2))/2
y = (18 + 3/2)/2
y = ((36 + 3)/2)/2
y = (39/2)/2
y = 39/4
Explicação passo a passo:
X = 9 - (18 + 3/2)/2 + 1/2
X = 9 - ((36 + 3)/2)/2 + 1/2
X = 9 - (39/2)/2 + 1/2
X = 9 - 39/4 + 1/2
X = (36 - 39 + 2)/4
X = -1/4
1 1 1 9
3 5 6 45
4 8 11 76
L2=L2-3L1
L3=L3-4L1
1 1 1 9
0 2 3 18
0 4 7 40
L3=L3-2L2
1 1 1 9
0 2 3 18
0 0 1 4
L1=L1-L3
L2=L2-3L3
1 1 0 5
0 2 0 6
0 0 1 4
L2=L2/2
1 1 0 5
0 1 0 3
0 0 1 4
L1=L1-L2
1 0 0 2 ==>x=2
0 1 0 3 ==>y=3
0 0 1 4 ==> z=4