已知abc均為自然數2的A次方等於3的B次方等於6的C次方求證ab-bc=ac

已知abc均為自然數2的A次方等於3的B次方等於6的C次方求證ab-bc=ac

令2^A=3^B=6^C=D則A=logD/log2;B=logD/log3;C=logD/log6則ab-bc=(logD/log2)*(logD/log3)-(logD/log3)*(logD/log6)=logD*logD(log6-log2)/(log2*log3*log6)=logD*logD*(log(6/2))/(log2*log3*log6)=logD*l…