6、2

7 、( 1)x & gt； 0 (2)x≤4 and x≠ 1

8、-3/2

9, according to the empty order is (3,5), (-1,-1), (3,6), (4,6), (-5,6), 8.

3、(- 1/2,0)

4( 1) is greater than or equal to the root number 3 minus 1 and less than or equal to the square root of 6 minus1(2)-9,0 (3) x ≦-1.

10, minus two-thirds root number three, two-thirds root number two,-1, two-thirds root number three, 0, 1.

1 1, (1)x is greater than or equal to 4 or x is less than or equal to-1 (2) r (3)- 1