√10 < √16 < √25 < √36 < √49 < √64 < √75
√10 < 4 < 5 < 6 < 7 < 8 < √75
{4; 5; 6; 7; 8}
cos2x+pi/3=0
cos2x=-p/3
2x=-p/3 это все делим на 2
x=-p/6
3-х-х=4
-2х=-3+4
-2х=1
х=-1/2
<span>49-(5d+3)^2=7</span>²-(5d+3)²=(7+5d+3)(7-5d-3)=(10+5d)(4-5d)=5(2+d)(4-5d)
...=-3с+6-1,5с-3=-4,5с+3
при с=-4/9
-45/10×(-4/9)+3=20/10+3=5