Question

(x-1)^3 - (x+1)^3 меньше или равно x-6x^2

Answer 1

х3 - 3х2 + 3х-1-(х3+3х2+3х+1) <= х-6x2

х3-3х2+3х-1-х3-3х2-3х-1<= x-6x2

-6х2-2<= x-6x2

-x-2<=0

x>=-2