Log2√(7/48) +log2 12 -(1/2)log2 42要详细点的额

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Log2√(7/48)+log212-(1/2)log242要详细点的额Log2√(7/48)+log212-(1/2)log242要详细点的额Log2√(7/48)+log212-(1/2)log2

Log2√(7/48) +log2 12 -(1/2)log2 42要详细点的额
Log2√(7/48) +log2 12 -(1/2)log2 42
要详细点的额

Log2√(7/48) +log2 12 -(1/2)log2 42要详细点的额
log2√(7/48)+log2 12 -1/2log2 42
=log2√(7/48)+log2(12)-log2√42
=log2√(7/48)*12/√42
=log2√7*144/48*42
=log2√(1/2)
=1/2log2(1/2)
=-1/2