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2

Ответы и объяснения

2013-11-11T21:39:34+04:00
2013-11-11T21:46:51+04:00
-x^2 - 4x + 5 >= 0
x^2 + 4x - 5 <= 0
D/4 = 4 + 5 = 9
x1 = -2 + 3 = 1=>x<=1
x2 = -2 - 3 = -5=>x>=-5 => -5<=x<=1
(1 - (-5))/2 = 3 => середина -5 + 3 = -2

(4x - 1)/(3x + 1) >=1 l * (3x + 1) не равном нулю => х не равном - 1/3
4x - 1 >= 3x + 1
x >= 2

{7x - 14 >= 0
{2x>=8

{x >= 2
{x>=4

Ответ: х >= 4