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標題:
if log 3=x log5=y , express each of the following in terns
發問:
if log 3=x log5=y , express each of the following in terns of x and y . (a) log 27/45 (b) log250-log90
最佳解答:
(a) log 27/45 =log3/5 =log3-log5 =x-y (b) log250-log90 =log250/90 =log25/9 =log5^2-log3^2 =2log5-2log3 =2y-2x
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