x-(3-1)≤x+2
x - 2 ≤ x+2
x 为一切实数.
x-5/2+1＞x-3
x-3/2＞x-3
x 为一切实数.
x/3 - 2 ＜1- x/5
8x/15 < 3
8x < 45
x < 45/8
这题的题目没写清楚?
x-(3x-1)≤x+2
x-3x +1 ≤ x +2
- x ≤ 1
x ≥ -1