过程怎么算的？
答案:3 悬赏:40 手机版
解决时间 2021-03-02 05:49
- 提问者网友：暮烟疏雨之际
- 2021-03-01 09:16
过程怎么算的？
最佳答案
- 五星知识达人网友：舍身薄凉客
- 2021-03-01 10:05
|(a-1)/(a-2)| ≤ 1/2
-1/2 ≤(a-1)/(a-2) ≤ 1/2
(a-1)/(a-2) ≤ 1/2 (1) and
-1/2 ≤(a-1)/(a-2) (2)
from (1)
(a-1)/(a-2) ≤ 1/2
[2(a-1) - (a-2)] /[2(a-2)] ≤0
a/[2(a-2)] ≤0
0≤a < 2 (3)
from (2)
-1/2 ≤(a-1)/(a-2)
[2(a-1)+(a-2) ]/[2(a-2)] ≥0
(3a-4)/[2(a-2)] ≥0
a>2 or a< 4/3 (4)
(3) and (4)
0≤a < 2 and "a>2 or a< 4/3"
4/30≤a≤1 (6)
(5) and (6)
=> 4/3
-1/2 ≤(a-1)/(a-2) ≤ 1/2
(a-1)/(a-2) ≤ 1/2 (1) and
-1/2 ≤(a-1)/(a-2) (2)
from (1)
(a-1)/(a-2) ≤ 1/2
[2(a-1) - (a-2)] /[2(a-2)] ≤0
a/[2(a-2)] ≤0
0≤a < 2 (3)
from (2)
-1/2 ≤(a-1)/(a-2)
[2(a-1)+(a-2) ]/[2(a-2)] ≥0
(3a-4)/[2(a-2)] ≥0
a>2 or a< 4/3 (4)
(3) and (4)
0≤a < 2 and "a>2 or a< 4/3"
4/30≤a≤1 (6)
(5) and (6)
=> 4/3
全部回答
- 1楼网友：十鸦
- 2021-03-01 11:50
- 2楼网友：煞尾
- 2021-03-01 10:18
简单
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