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5*6=30㏒以2為底4=㏒以3為底9;㏒以4為底2=㏒以9為底3;㏒以2為底3=㏒以4為底9;㏒以3為底2=㏒以9為底4;所以去掉4個;當1為底數時,不成立所以去掉5個;當1為真數時,5個均為0所以去掉4個;所以為30-4-5-4=17
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