1)x平方-2x-8小于等于0
x²-2x-8≤0
(x-4)(x+2)≤0
-2≤x≤4
2)x平方+3x-10>0
x²+3x-10>0
(x+5)(x-2)>0
x>2或x<-5
3)3(x平方-1)大于等于4(x-1)
3x²-3≥4x-4
3x²-4x+1≥0
(3x-1)(x-1)≥0
x≥1或x≤1/3
4)x(x+3)<2(x+3)
x²+3x<2x+6
x²-x-6<0
(x-3)(x+2)<0
-2
(3)3(x+1)(x-1)>=4(x-1)
若x=1,成立
若x>1,3(x+1)>=4
x>=1/3,则x>1
若x<1
3(x+1)<=4
x<=1/3
所以x>=1或x<=1/3
(4)若x>-3,x<2
若x<-3,x>2不成立
所以-3