3的1-2x次方-1≥0
人气:187 ℃ 时间:2020-04-14 04:32:37
解答
3的1-2x次方-1≥0
3^(1-2x)-1≥0
3^(1-2x)≥1
3^(1-2x)≥3^0
3>1
∴1-2x≥0
2x≤1
x≤1/2
把下面采纳了
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