log2 √7/24+log2 12-log4 42
=log2 （√7/24× 12）-log4 42
=log2 √42-log4 42
=1/2lg42/lg2-lg42/lg4
=1/2lg42/lg2-1/2lg42/lg2
=0
log2 √7/24+log2 12-log442
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