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因為f(2)=m f(3)=n 所以f(6)=f(2*3)=f(2)+f(3)=m+n f(12)=f(3*4)=f(3)+f(4)=f(3)+2f(2)=n+2m 所以f(72)=f(6*12)=f(6)+f(12)=2n+3m
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