不等式组1.2x＞1-xx+2＜4x-12.x-5＞1+2x3x+2＜4x3.2/3x+5＞1-xx-1＜3/4x-1/8_数学解答

不等式组
1.
2x＞1-x
x+2＜4x-1
2.
x-5＞1+2x
3x+2＜4x
3.
2/3x+5＞1-x
x-1＜3/4x-1/8

人气：314 ℃　时间：2020-04-13 19:11:53

解答

1.
2x＞1-x
3x>1
x>1/3
x+2＜4x-1
3x>3
x>1
大大取大
x>1
2.
x-5＞1+2x
x2
x>2
两个不能同时成立
无解
3.
2/3x+5＞1-x
5/3x>-4
x>-12/5
x-1＜3/4x-1/8
1/4x