Х^2-2х-7=8
х^2-2х-7-8=0
х^2-2х-15=0
D=b^2-4ac=4-4*1*(-15) =4+60=64=8^2
х1= (-b+√D)/2=5
х2=(-b-√D) /2=-3
Функция равна 8 при х=5 и х=-3
Ответ: -3; 5
Как-то так
<span>(12*5+20) : 4 =20</span>
<span><span>12* (5+20) : 4 =75</span></span>
<span><span><span>12 * (5+20 : 4) =120 </span></span></span>
<span><span><span><span>10000 : (200-20*5) =100</span></span></span></span>
<span><span><span><span><span>(10000 : 200-20) * 5 =150</span></span></span></span></span>
<span><span><span><span><span><span>10000 : (200-100) * 5 =500</span></span></span></span></span></span>
135:5 = 27;
95.5 = 19;
27 - 19 = 8.