(1)-2x2>3x-9;（2x-3)(x+3）<0 -3(2)x2-2|x|+1<=0; (|x|-1)²<=0 |x|=1 x=±1(3)(1/2)2x-3<=4;2x-3>0,2x-3<=163/2(4)x-1<2x+5<3x-6x-1<2x+5得x>-62x+5<3x-6得x>11解为x>11
