回答:
#A X B = 4i-10j-18k#
说明:
#A = I + 4J-2K#
#B = 3I-6J + 4K#
#AXB = i((A j * B k) - (A k * B j)) - j((A i * B k) - (A k * B i))+ k((A i * B j) - (A j * B i))#
#AXB = I(4 * 4 - (( - 2)*( - 6))) - J(1 * 4-(3 *( - 2))+ K(1 *( - 6) - (3 * 4 ))#
#A X B = i(16-12)-j(4 + 6)+ k(-6-12)#
#A X B = i(4)-j(10)+ k(-18)#
#A X B = 4i-10j-18k#