х = 1 , 5 * 5 : 0 . 7 5 = 1 0
<span>83-29=d*27</span>
<span>27*d=54 /2</span>
<span>d=27</span>
(x+3)^2 >=(2x+1)^2
x+3 >=2x+1
x<=2
Ответ (-oo 2]