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Ответ:

1) (x+8)²-x²<=11x

x²+16x+64-x²<=11x

64<=-5x

x<=-64/5

2)x²-(9-x)²>-2x

x²-87+18x-x²>-2x

x>85/18

3)(12+x)²>=x²+21x

144+24x+x²>=x²+21x

24x-21x>=-144

x>=-48

4) x²<(25-x) ²+25x

x²<x²-50x+625+25x

x<25

1)(y+7)³-y³-21y²>=0

y³+21y²+147y+343-y³-21y²>=0

21y²-147y+343-21y>=0

y<=7/3

2)-24y²+(8-y)³+y³<=0

-24y²-y³+24y²-192y+512+y³<=0

-192y<=-512

y>=8/3

3)(6-y) ³+y³-18y²<0

-y³+18y²-108y+216+y³-18y²<0

-108y<-216

y>2

4)y³-27y²-(y-9)³>0

y³-27y²-y³+27y²-243y+729>0

y<3