(log2(20))/(log2(16))=

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(log2(20))/(log2(16))=
(log2(20))/(log2(16))=

(log2(20))/(log2(16))=
(log2(20))/(log2(16))
=(log2(20))/(log2(2的4次方))
=(log2(20))/(4log2(2))
=(1/4)(log2(4x5))
=(1/4)[log2 4+log2 5]
=(1/4)[log2 2²+log2 5]
=(1/4)[2log2 2+log2 5]
=(1/4)[2+log2 5]
=1/2+(1/4)log2 5