5^3x+2=7^6x-1怎么做?
1个回答
两边取对数
lg5^(3x+2)=lg7^(6x-1)
(3x+2)lg5=(6x-1)lg7
所以(6lg7-3lg5)x=2lg5+lg7
x=(2lg5+lg7)/(6lg7-3lg5)
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