Question

решите неравенства 35.12 1,3​

Answer 1

1) y^3+21*y^2+147*y+343-y^3-21*y^2>0

147y+343>0

147y>-343

y>-2.(3)

2)216-54y+18y^2-y^3+y^3-18y^2<0

216-54y<0

54y>216

y>4