X - y = - 3
2x + 7y = 3
••••••
7x - 7y = - 21
7x + 2x - 7y + 7y = - 21 + 3
9x = - 18
X = - 2
••••••••
- 2 - y = - 3
y = - 2 + 3
y = 1
X + y = - 2 + 1 = - 1
1) 2215 : 5 = 443
2) 3159 - 884 = 2315
3) 2315 - 443 = 1872
4) 512 х 1872 = 958464, и это ответ
Scsi ca was the day we не обращай внимания
X^2 - x - 6 >= 0;
4x^2 - 4x - 2*(x^2 + 2x + 2) <= 8;
x^2 - x - 6 >=0;
4x^2 - 4x - 2x^2 - 4x - 4 <= 8;
x^2 - x - 6 >= 0;
2x^2 - 8x - 4 - 8 <= 0;
x^2 - x - 6 .= 0;
2x^2 - 8x - 12 <=0;
x^2 - x - 6 = 0;
x^2 - 4x - 6 <=0
x >= 4x;
x <= x/4
а там честно не знаю