Question

Помогите плиз решить (срочно надо)

Answer 1

№2

x = (-b +/- sqrt{D})/2a

x = 1 +/- 3i

b = -1

a = 1/2

D = b^2 - 4ac = = -3

D = 1 -2c = -3

c = 2

Ответ: 1/2*x^2 - x + 2 = 0

№3

(2+i)x - (1-i)y = 1 + 3i

2x + ix -y + iy = 1 + 3i

(2x-y) + (x+y)i = 1 + 3i

$left { {{2x-y=1} atop {x+y=3}} right. \left { {{3x=4} atop {x+y=3}} right.\left { {{x=4/3} atop {y=5/3}} right.$