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一般にべき乗の指数に対数があると元に戻ります
指数関数と対数関数が逆関数だから
数式で説明するなら、
2^(log₂x) = y のとき、両辺の対数を取って
log₂(x) = log₂(y) なので x=y
y = 2^(log₂x) = (logの中身) = x
Were you able to resolve your confusion?
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