16)(7x+2 /6) - x <= (5x+4/3) -4x <br>(7x+2/6)-(5x+4/3) <= -3x<br>7x+2-10x-8 <=-18x<br>15x <=6<br>x<= 2/5<br>(-oo; 2/5]
17)
y=√(x+1)+ √(3x-x^2)
{x+1>=0{3x-x^2 >=0
{x >=-1{x(3-x) >=0
{x >=-1{x>=0{x<=3<br>
------------------------> -1 0 + 3
Ответ [0;3]
18)y=3x^2-6x+1
y'=6x-6=0x=1 y(1)=3-6+1 =-2 мин-oo макс Ответ
[-2;+oo)