若2的x次方=8的y+1次方,81的y次方=9的x-5次方,则x的y次方=?
若2的x次方=8的y+1次方,81的y次方=9的x-5次方,则x的y次方=?
数学人气:937 ℃时间:2019-10-08 15:08:16
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2的x次方=8的y+1次方2的x次方=2的3(y+1)次方x=3(y+1)=3y+3----------------(1)81的y次方=9的x-5次方3的4y次方=3的2(x-5)次方4y=2(x-5)=2x-10----------------(2)把(1)代入(2)4y=2(3y+3)-104y=6y+6...
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