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数学
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log3(x-1)=log9(x+5) 求x
人气:161 ℃ 时间:2020-02-01 09:31:57
解答
log(9)(x-1)²=log(9)(x+5)
∴(x-1)²=x+5
(x-4)(x+1)=0
∴x=4or-1
∵x-1>0
∴x=4
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