B1 = 15
S = 75
q - ?
S = b1/ (1 - q) = 75
15 / (1 - q) = 75
75 (1 - q) = 15
1 - q = 0,2
- q = - 0,8
q = 0,8
.........................
3(3-2i)+(5+3i) = 9 - 6i + 5 + 3i = 14 - 3i
(2 - i)² = 4 - 4i + i² = 4 - 4i - 1 = 3 - 4i
(1 + 2i)³ = 1³ + 6i + 6i² + 8i³ = 1 + 6i - 6 + 8i * i² = -5 + 6i - 8i = -5 - 2i
{y=2-3x
x²-x(2-3x)=3.36
x²-2x+3x=3,36
x²+x=3,36
x(x+1)=3,36
x=3,36 или x+1= 3,36
x=4,36