решение
<span>2a(3a-b+4)</span>
6a^2-2ab+8a
(3х-2)*(х+8)=0\ разделим обе части на (5-2)
3х-2=0 х=2\3
х+8=0 х=-8
-10(0,7-3b)+14b+13=(-7+30b)+14b+13=44b+6
X(x^2-11x+28) = 0
X=0 x^2-11x+28 =0
D = 121 - 112 = 9= 3^2
X1 = 7 X2=4
<span>x^3+7x^2-18x = 0
x(x^2 +7x - 18) = 0
x=0 x^2+7x-18 = 0
D = 49 +72 = 121 = 11^2
x1 = 2 X2 = -9
</span>
<span>5x^4-6x^3+x^2=0
X^2(5x^2 - 6x + 1) =0
x^2 =0 5x^2 - 6x +1 =0
x = 0 D = 36 -20 = 16 = 4^2
x1 = 1 x2=0.2
</span>
{ 5(2x - 1) - 3(3x + 6) < 2
{ 2x - 17 > 0
Раскрываем скобки
{ 10x - 5 - 9x - 18 - 2 < 0
{ x > 17/2
Приводим подобные
{ x < 25
{ x > 8,5
Ответ: x ∈ (8,5; 25)