下列的運算何者正確?(a>0,a1,x>y>0)
(不正確者,舉出反例)
(1)ax-y=ax-ay
(2)log(x-y)=log x-log y
(3)logax 除以logay=loga x除以y
(4)logax 除以logay=loga(x-y)
(5)logax 除以logay=logax-logay