函数y=log2(1/x2-2x+5)的值域 =.=
人气:487 ℃ 时间:2020-06-18 03:41:51
解答
x在R上,那么x^2-2x+5在[4,+无穷)
取倒数为(0,1/4]
取对数就是(-无穷,-2]
答案就是(-无穷,-2]
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