(168/25+266/125):2,212+5 1/6=
(840/125 + 266 / 125):2,212+5 1/6=
1106/125:2,212+5 1/6=
1106/125*1000/2212 + 5 1/6=
4+5 1/6=9 1/6
200, 500, 700, 1000
..................................
5x^2-8x+3=0
a=5; b= -8; c=3
D=b^2-4ac= -8^2-4*5*3=64-60=4
4>0 2 корня
x1= -b+√D / 2a
x1= 8+2 / 10
x1= 10/10=1
x2= -b-√D / 2a
x2= 8-2 / 10
x2= 6/10=3/5
Ответ: 1; 3/5