I¹²³ = -i
z1 = 1 - i
z2 = 2i - 2
z1×z2 = (1 - i)(2i - 2) = 2i + 2 - 2 + 2i = 4i
z1/z2 = (1 - i)/(2i - 2) = ½
|z1×z2| = 4
arg z2 = 3π/4
Re(4i) = 0
Im(½) = 0
(x-2 12/21)+2 10/21=7 2/21
х- 2 12/21= 7 2/21- 2 10/21
х-54/21=149/21-52/21
х-54/21=97/21
х=97/21+54/21
х=151/21
х=7 4/21
проверка
(7 4/21-2 12/21)+2 10/21=7 2/21
151/21-54/21+52/21=149/21
149/21=149/21
7 2/21= 7 2/21
<span>74-35=39 проверка...39+35=74
59+34=93 ПРОВЕРКА....93-34=59
</span>
Ответ : В одном битоне молока : 93 / 3 = 31 л
1) -3x = 3 - 12
-3x = -9
x = -9/(-3)
x = 3