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標題:
中 4 數 學 題 (about log )
發問:
log (x+16) - log (x-2)=1 請給過程,謝謝
最佳解答:
log (x+16) - log (x-2)=1 log[ (x+16) / (x-2)]=1 (x+16) / (x-2)=10 (x+16) =10(x-2) x+16 =10x-20 9x =36 x =4
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其他解答:
log (x+16) - log (x-2)=1 => log [(x+16)/(x-2)] = log 10 => (x+16)/(x-2) = 10 => x+16 = 10(x-2) => 9x = 36 => x = 4|||||log(x+16)-log(x-2)=1 log[(x+16)/(x-2)]=1 log[(x+16)/(x-2)]=log10 (x+16)/(x-2)=10 x+16=10(x-2) x+16=10x-20 -9x=-36 x=4
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