А)6х>=-18
х>=-3
б)-4х>36
-х>9
х<-9
в)0,5(х-2)+1?5х
0,5х-1+1?5х
0,5х?5х
-4,5х?0
X=0 y=0-0+4 1/2=4,5
y=0 1/2x²-3x+4 1/2=0
x²-6x+9=0
(x-3)²=0
x=3
Ответ (0;4,5);(3;0)
((y+1)/(y-1)-y/(y+1))*(3y+1)/(y²+y)=((y+1)²-(y²-y)/(y²-1))*(3y+1)/(y²+y)=
=((y²+2y+1-y²+y)/(y²-1))*(3y+1)/(y²+y)=((3y+1)/(y²-1))*(3y+1)/(y²+y)=
=(3y+1)²/((y-1)(y+1)*y*(y+1))=(3y+1)²/(y*(y+1)²*(y-1)).
Ответы 2 примера и 4 задачи