A)0.42<0.43,б)3/16+10/16=13/16=0.81;19/25=0.76;0.81>0.76,в)4.5>4.5,г)2.8-1.7=1.1;2.4-2.2=0.2;1.1>0.2
X^2 - 5x + 6 = 0
D = b^2 - 4ac
D = -5^2 - 4 * 1 * 6 = 25 - 24
D = 1
x1 = 5 + 1 / 2 = 3
x2 = 5 - 1 / 2 = 2
Ответ : x1 = 3 ; x2 = 2
5x^2 - 9x - 2 = 0
D = b^2 - 4ac
D = -9^2 - 4 * 5 * (-2) = 81 + 40 = 121
D = 11
x1 = 9 + 11 /2 = 9
x2 = 9 - 11 / 2 = -1
Ответ : x1 = 9 ; x2 = -1
Решение во вложенииииииииииииииииииииииииииииии
{2x - 3y = 8 |*5 {10x - 15y = 40
{7x - 5y = -5 |*-3 {-21x + 15y = 15
-11x = 55
x = -5
2 *(-5) - 3y = 8
-3y = 8 + 10
-3y = 18 Ответ:(-5;-6)
y = -6