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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化简下列各式 2、log2根号7/48+log小2 12-1/2log小2 42-1
![化简下列各式 2、log2根号7/48+log小2 12-1/2log小2 42-1](/uploads/image/z/2782130-50-0.jpg?t=%E5%8C%96%E7%AE%80%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F+2%E3%80%81log2%E6%A0%B9%E5%8F%B77%2F48%2Blog%E5%B0%8F2+12-1%2F2log%E5%B0%8F2+42-1)
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
=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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