Ответы и объяснения

2012-06-02T05:24:03+00:00

0.2x-0.2-0.2x^2-0.5x<0.6x-4 |*-10

-2x+2+2x^2+5x>-6x+40

2x^2-2x+5x+6x+2-40>0

2x^2+9x-38>0                             D=81-4*2*(-38)=385

                                                  x=(-9-sqr(385))/4