原式=log2(√7/48)+log2(12)-log2(√42)-log2(2)
=log2(√7/48×12÷√42÷2)
=log2(√1/8)
=log2(2^3/2)
=3/2
化简下列各式 2、log2根号7/48+log小2 12-1/2log小2 42-1
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