化简log2根下7\48+log212-1\2log242 2,2,2是底,根下7\48,12,42.是真数
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![化简log2根下7\48+log212-1\2log242 2,2,2是底,根下7\48,12,42.是真数](/uploads/image/z/2111462-62-2.jpg?t=%E5%8C%96%E7%AE%80log2%E6%A0%B9%E4%B8%8B7%5C48%2Blog212-1%5C2log242+2%2C2%2C2%E6%98%AF%E5%BA%95%2C%E6%A0%B9%E4%B8%8B7%5C48%2C12%2C42.%E6%98%AF%E7%9C%9F%E6%95%B0)
化简log2根下7\48+log212-1\2log242 2,2,2是底,根下7\48,12,42.是真数
化简log2根下7\48+log212-1\2log242 2,2,2是底,根下7\48,12,42.是真数
化简log2根下7\48+log212-1\2log242 2,2,2是底,根下7\48,12,42.是真数
log 2 根下7/48+log 2 12-1/2log 2 42
=log 2 根下7/48+log 2 12-log 2 根号42
=log 2 [根下7/48 * 12 / 根号42 ]
=log 2 [根下7/(48*42) * 12 ]
=log 2 [1 / 根下2 ]
=log 2 [2^(-1/2)]
=-1/2