x<=1/2则2x-1<=0所以1-2x-x<1x>0所以0x>1/2则2x-1>0所以2x-1-x<1x<2所以1/2所以0
0<1/3<1所以log1/3(x)是减函数所以x²-3x-4<2x+10真数大于000(x-4)(x+1)>0x<-1,x>4x²-3x-4<2x+10x²-5x-14<0(x-7)(x+2)<0-2所以-2
