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1.配方 y=2(x^2+3+9/4)+5/2 y=2(x+3/2)^2+5/2 所以最大為正無窮 最小為5/2 值域為[5/2,+無窮) 2.(1/x)-2如果是這樣的話y不等於-2 如果是這樣的話1/(x-2)是y不等於0
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