Respostas

2013-10-17T19:38:26-03:00
12x-4x²+39-13x(2x-1) < 0
12x-4x²+39-26x²+13x < 0
-30x²+25x < -39
12x-4x²+39-13x(2x-1) < 0
12x-4x²+39-26x²+13x < 0
-30x²+25x < -39