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2 1 2
1 1 1
0 2 3
= 2(3-2) - 1(3-0) +2(2-0) = 2-3+4 = 3
.
2) det C
2 -3 1
2 1 -1
1 1 1
= 2(1+1) +3(2+1) + 1(2-1) = 4 +9+1= 14
.
3) det D
2 3 1
1 2 3
3 2 1
= 2(-4) -3(-8) +1(-4) = -8+24 -4 = 12
.
4) det E
1 1 -1
2 4 2
1 3 1
= 1(-2) - 1(0) -1(2)= -2 - 0 - 2 = -4
2 1 2 | 2 1
1 1 1 | 1 1
0 2 3 | 0 2
det(B) = 6 + 0 + 4 - 0 - 4 - 3 = 3
2.
2 -3 1 | 2 -3
2 1 -1 | 2 1
1 1 1 | 1 1
det(C) = 2 + 3 + 2 - 1 -(-2) - (-6)
= 14
3.
2 3 1 | 2 3
1 2 3 | 1 2
3 2 1 | 3 2
det (D) = 4 + 27 + 2 - 6 - 12 - 3
= 12
4.
1 1 -1 | 1 1
2 4 2 | 2 4
1 3 1 | 1 3
det (E) = 4 + 2 - 6 - (-4) - 6 - 2
= - 4
cara di atas menggunakan cara sarrus
secara umum cara sarrus yaitu dengan menulis ulang 2 kolom pertama
a b c | a b
d e f | d e
g h i | g h
det = aei + bfg + cdh - ecg - afh - bdi