x-(3-1)≤x+2
x - 2 ≤ x+2
x 為一切實(shí)數(shù).
x-5/2+1＞x-3
x-3/2＞x-3
x 為一切實(shí)數(shù).
x/3 - 2 ＜1- x/5
8x/15 < 3
8x < 45
x < 45/8
這題的題目沒寫清楚?
x-(3x-1)≤x+2
x-3x +1 ≤ x +2
- x ≤ 1
x ≥ -1