1、求适合不等式1减2X/3大于负2的所有非负整数解

1
1 - 2x/3 > -2
1 + 2 > 2x/3
2x < 9
x < 4.5
x = 1,2,3,4
2-1
0.2x - 0.3/0.2 - x + 1/6 < 1
0.2x - x < 1 + 3/2 - 1/6
-0.8x < 7/3
- 4x/5 < 7/3
x > -35/12
2-2
(x+1)(x-1) -2 > x(x+3)
x^2 - 1 - 2 > x^2 +3x
-3 > 3x
x < -1