c = 2a-4b = 2(-7,8,4)-4(-4,-2,-3) = (-14,16,8)-(-16,-8,-12) = (-14+16,16+8,8+12) = (2,24,20)
Ответ: c = (2, 24, 20)
c = 2a-4b = 2(-7,8,4)-4(-4,-2,-3) = (-14,16,8)-(-16,-8,-12) = (-14+16,16+8,8+12) = (2,24,20)
Ответ: c = (2, 24, 20)