log3 5=a log3 7 =b 求log25 7
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log35=alog37=b求log257log35=alog37=b求log257log35=alog37=b求log257log257=log5²7=1/2log57=1/2(log37
log3 5=a log3 7 =b 求log25 7
log3 5=a log3 7 =b 求log25 7
log3 5=a log3 7 =b 求log25 7
log25 7
=log5² 7
=1/2 log5 7
=1/2(log3 7)/(log3 5)
=1/2×b/a
=b/(2a)
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㏒25 7=㏒3 25÷㏒3 7
=a^2/b
log25 7
=log3 7 /(log 3 25)
=b/(log 3 5^2)
=b/2(log 3 5)
=b/2a
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