(2x-5)2+(3x+1) 2>13(x2-10)解:4x2-20x+25+9x2+6x+1>13x2-130 13x2-14x+26>13x2-130 26-14x>-130 -14x>-156 14x﹤156 x﹤78/7
(2x-5)^2+(3x+1)^2>13(x^2-10) (4x^2-20x+25)+(9x^2+6x+1)>13x^2-130 -14x>-156 两边除以-14得到x<78/7