1) 10.2:04-2.6.1-3); 3) 10,0,68-5.0.008 + 4,44; 2) 4.5+ 5,0.4-10.0.006: 4] 25,0.4-105 10,0.045, Можно

Question

Алгебра: 1) 10.2:04-2.6.1-3); 3) 10,0,68-5.0.008 + 4,44; 2) 4.5+ 5,0.4-10.0.006: 4] 25,0.4-105 10,0.045, Можно

Djanik228 · Accepted Answer

1) 0x - 2 = 0
2) x^2 + x + 1 = 0
3) 3x^2 + ax + 6 = 0
D = a^2 - 4*3*6 = a^2 - 72
Если у квадратного уравнения нет корней, то D < 0
a^2 - 72 < 0
a^2 < 72
-√72 < a < √72
-6√2 < a < 6√2
Целые а на этом промежутке: -8, -7, -6, ..., 6, 7, 8
4) j^17 + j^2005 = j^16*j + j^2004*j = 1*j + 1*j = 2j
5) (-j)^3 = (-j)^2*(-j) = -1(-j) = j
6) z = j; z^2 = j^2 = -1; z^2 + 361 = -1 + 361 = 360
7) z = -j; z^3 + 3z = (-j)^3 - 3j = j - 3j = -2j (см. п. 5))
8) z1 = 1 + j; z2 = 1 - j
z1 + z2 = 1 + j + 1 - j = 2
z1 - z2 = 1 + j - 1 + j = 2j

MOGZ ответил

1) 10.2:04-2.6.1-3); 3) 10,0,68-5.0.008 + 4,44;
2) 4.5+ 5,0.4-10.0.006:
4] 25,0.4-105
10,0.045,
Можно