数学大佬来看看,这个方程咋解?
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-2^(1/2) < 2^|a-1| < 2^(1/2)
2^|a-1| > 2^0 =1 > -2^(1/2) ; 对于所有 a
ie
我们需要
2^|a-1| < 2^(1/2)
case 1: a<1
2^|a-1| < 2^(1/2)
2^[-(a-1)] < 2^(1/2)
-(a-1) < 1/2
-a < -1/2
a> 1/2
solution for case 1: 1/2<a <1
case 2 : a≥1
2^|a-1| < 2^(1/2)
2^(a-1) < 2^(1/2)
(a-1) < 1/2
a < 3/2
solution for case 1: 1≤a <3/2
ie
-2^(1/2) < 2^|a-1| < 2^(1/2)
=>
1/2<a<3/2
2^|a-1| > 2^0 =1 > -2^(1/2) ; 对于所有 a
ie
我们需要
2^|a-1| < 2^(1/2)
case 1: a<1
2^|a-1| < 2^(1/2)
2^[-(a-1)] < 2^(1/2)
-(a-1) < 1/2
-a < -1/2
a> 1/2
solution for case 1: 1/2<a <1
case 2 : a≥1
2^|a-1| < 2^(1/2)
2^(a-1) < 2^(1/2)
(a-1) < 1/2
a < 3/2
solution for case 1: 1≤a <3/2
ie
-2^(1/2) < 2^|a-1| < 2^(1/2)
=>
1/2<a<3/2
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