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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![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?](/uploads/image/z/5299002-18-2.jpg?t=%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3Dlog1%2F2%28x%5E2-2ax%2B3%29a%CE%B5R%EF%BC%881%EF%BC%89%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0%E7%9A%84%E5%80%BC%E5%9F%9F%E4%B8%BAR%2C%E6%B1%82a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%882%EF%BC%89%E5%BD%93a%E5%8F%96%E4%BD%95%E5%80%BC%E6%97%B6%2C%E5%9C%A8%5B-1%2C%2B%E2%88%9E%29%E4%B8%8A%E6%9C%89%E6%84%8F%E4%B9%89%3F%EF%BC%883%EF%BC%89%E5%AE%9E%E6%95%B0a%E5%8F%96%E4%BD%95%E5%80%BC%E6%97%B6%2C%E5%9C%A8%28-%E2%88%9E%2C1%5D%E5%86%85%E6%98%AF%E5%A2%9E%E5%87%BD%E6%95%B0%3F)
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