①函数y=(2/3)^(x²-4x-6)的单调递减区间是______（答案：[2,+无穷)或者(2,+无穷)）②奇函数f(x)的定义域为R,函数g(x)=x^2+f(x-1)+f(x+1),若g(1)=4,则g(-1)的值为_____（答案：-2）③函数y=(a^2-1)^x在R上递增,
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