3X的平方-X-4>0 x²-1/3x-4/3>0(x-4/3)(x+1)>0所以x<-1或x>4/3(2)(x+3)(x-4)<=0,-30,x>3或者x<-4(4)(x-4)²<=0,x<=4
(1)(3X+2)(x-1)>0 X<-2/3或者X>1(2)(x+3)(x-4)<=0,-3(3)(x+4)(x-3)>0,x>3或者x<-4(4)(x-4)²<=0,x<=4