过程怎么算的? 20
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|(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"
4/3<a<2 (5)
0≤a≤1 (6)
(5) and (6)
=> 4/3<a ≤1
-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"
4/3<a<2 (5)
0≤a≤1 (6)
(5) and (6)
=> 4/3<a ≤1
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