已知函数f(x)=log1/2(x^2-2ax+3)aεR（1）已知函数的值域为R,求a的取值范围（2）当a取何值时,在[-1,+∞)上有意义?（3）实数a取何值时,在(-∞,1]内是增函数?

已知函数f(x)=log1/2(x^2-2ax+3)aεR（1）已知函数的值域为R,求a的取值范围（2）当a取何值时,在[-1,+∞)上有意义?（3）实数a取何值时,在(-∞,1]内是增函数?
已知函数f(x)=log1/2(x^2-2ax+3)aεR（1）已知函数的值域为R,求a的取值范围（2）当a取何值时,在[-1,+∞)上有意义?（3）实数a取何值时,在(-∞,1]内是增函数?

已知函数f(x)=log1/2(x^2-2ax+3)aεR（1）已知函数的值域为R,求a的取值范围（2）当a取何值时,在[-1,+∞)上有意义?（3）实数a取何值时,在(-∞,1]内是增函数?
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