3/7 и 4/21
3/7 = 9/21
9/21 > 4/21
x² + x - 12 = 0
По теореме Виета : x₁·x₂=-12; x₁+x₂=-1
x₁ = -4; <em>x₂ = 3</em> - больший корень
Ответ : 3
14-2,5x = 1,5x - 18
4x = 32, x = 8
y = 14 - 2,5.8 = 14 - 20 = -6
P=/8,-6/
Угол А = 180 - 105 - 30 = 45
По теореме синусов:
<span>Сторона b = </span>5.657
<span>Сторона c = </span><span>7.727</span>