(1)
xx-1>=0
x + √(xx-1) >0
x>=1显然满足
x -x
=>
xx - 1 > xx无解
D=[1,+∞)
(2)
x增
√(x^2-1)增
=>
x+√(x^2-1)增
使f(x)=loga(x+√(x^2-1)也增,则g(x)=logax增
a > 1
(1)
xx-1>=0
x + √(xx-1) >0
x>=1显然满足
x -x
=>
xx - 1 > xx无解
D=[1,+∞)
(2)
x增
√(x^2-1)增
=>
x+√(x^2-1)增
使f(x)=loga(x+√(x^2-1)也增,则g(x)=logax增
a > 1