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数学
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logx [3+2·(根号2)]=-2,求X
人气:164 ℃ 时间:2020-05-10 09:08:17
解答
即x^-2=3+2√2
所以x²=1/(3+2√2)=3-2√2
x²=(√2-1)²
底数x>0
所以x=√2-1
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