Odpowiedzi

2010-04-08T17:57:59+02:00

a.2 x-3)(3x+5)-(x+2)(6x-1 <2
(2x-6)(3x+5)-(6x2-x+12x-2)<2
6x2+10x-18x-30-6x2+x-12x+2<2
-20x<2+30-2
-20x<30 |:(-20)
x>- 1 1/2

b.3(x+5)(x-2)-5x >(3x-1)(1+x)+5 (3x+15)(x-2)-5x>3x+3x2-1-x+5
3x2-6x+15x-30-5x>2x+3x2+4
3x2+4x-2x-3x2>4+30
2x>34 |:2
x=17