Apa produk silang dari [2, -1, 4] dan [5, 2, -2]?

Apa produk silang dari [2, -1, 4] dan [5, 2, -2]?
Anonim

Menjawab:

# <2, -1,4> xx <5,2, -2> = <-6,24,9> #

Penjelasan:

Kita dapat menggunakan notasi:

# ((2), (- 1), (4)) xx ((5), (2), (- 2)) = | (ul (topi (i)), ul (topi (j)), ul (topi (k))), (2, -1,4), (5,2, -2) | #

# "" = | (-1,4), (2, -2) | ul (hat (i)) - | (2,4), (5, -2) | ul (hat (j)) + | (2, -1), (5,2) | ul (hat (k)) #

# "" = (2-8) ul (topi (i)) - (-4-20) ul (topi (j)) + (4 + 5) ul (topi (k)) #

# "" = -6 ul (topi (i)) +24 ul (topi (j)) +9 ul (topi (k)) #

# ' ' = ((-6),(24),(9)) #