-- (a + 1/a )X + 1 < 0 (a不等于0)解关于 X的不等式X^2 -- (a + 1/a )X + 1 < 0 (a不等于0)
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-- (a + 1/a )X + 1 < 0 (a不等于0)解关于 X的不等式X^2 -- (a + 1/a )X + 1 < 0 (a不等于0)
-- (a + 1/a )X + 1 < 0 (a不等于0)
解关于 X的不等式
X^2 -- (a + 1/a )X + 1 < 0 (a不等于0)
-- (a + 1/a )X + 1 < 0 (a不等于0)解关于 X的不等式X^2 -- (a + 1/a )X + 1 < 0 (a不等于0)
X2-(a+1/a)+1<0
(x-a)(x-1/a)<0
if a<1/a
即a∈(-∞,-1)∪(0,1)
此时a
即a∈(1,+∞)∪(-1,0)
此时 1/a