1-46*75=3450
2-65*30=1950
3-3450+1950=5400
Z1 + z2 = 2 + 3i + 1 + 4i = 3 + 7i
z1 - z2 = 2 + 3i - (1 + 4i) = 2 + 3i - 1 - 4i = 1 - i
z1 * z2 = (2 + 3i)*(1 + 4i) = 2 + 3i + 8i + 12*i^2 = 2 + 11i - 12 = -10 + 11i
![\frac{z1}{z2} = \frac{ 2 + 3i}{1 + 4i} = \frac{(2 + 3i)( 1 - 4i)}{(1 + 4i)(1 - 4i)} = \frac{2 + 3i - 8i - 12 {i}^{2} }{1 - 16 {i}^{2} } = \frac{2 - 5i + 12}{1 + 16} = \frac{14 - 5i}{17}](https://tex.z-dn.net/?f=+%5Cfrac%7Bz1%7D%7Bz2%7D++%3D++%5Cfrac%7B+2+%2B+3i%7D%7B1+%2B+4i%7D++%3D++%5Cfrac%7B%282+%2B+3i%29%28+1+-+4i%29%7D%7B%281+%2B+4i%29%281+-+4i%29%7D++%3D++%5Cfrac%7B2+%2B+3i+-+8i+-+12+%7Bi%7D%5E%7B2%7D+%7D%7B1+-+16+%7Bi%7D%5E%7B2%7D++%7D++%3D++%5Cfrac%7B2+-+5i+%2B+12%7D%7B1+%2B+16%7D++%3D++%5Cfrac%7B14+-+5i%7D%7B17%7D+)
1) 750:30=25(б)- по 30литров
2)240:20= 12(б)- по 20 литров
3)25+12=37(б)- всего привозят
Выражение
750:30+240:20=37(б)
Ответ: в 37 бидонах привозят молоко