For a fraction, after the denominator is reduced to the original (1/3) and the numerator is expanded to 3 times the original, is the fraction expanded or reduced, and by how much?
一个分数，把分母缩小到原来的(1/3)，分子扩大到原来的3倍后，这个分数扩大了还是缩小了，扩大或缩小了多少？
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