2)положительный3)отрицательный
(1/6 + 1 1/10) * 24 = (5/30 + 1 3/30) * 24 = 1 8/30 * 24 = 1 4/15 * 24 = 19/15 * 24 = (19 * 24)/15 = (19 * 8)/5 = 152/5 = 304/10 = 30,4
Ответ: 30,4.
D=169-4*7*15=169-120=49
<span>X1=(13-7)/4=5/4=1,25</span><span>X2=(13+7)/4=5</span><span>a=1,25</span>