本文探讨了一种奇特的分数现象，即通过不正规的方式约分却能得到正确答案的情况。例如49/98误操作后变为4/8，结果依然正确。文章进一步寻找了类似的例子，并提出了一个数学挑战：找出所有这样的分数并计算它们乘积的分母。
The fraction 49/98 is a curious fraction, as an inexperienced mathematician in attempting to simplify it may incorrectly believe that 49/98 = 4/8, which is correct, is obtained by cancelling the 9s.
We shall consider fractions like, 30/50 = 3/5, to be trivial examples.
There are exactly four non-trivial examples of this type of fraction, less than one in value, and containing two digits in the numerator and denominator.
If the product of these four fractions is given in its lowest common terms, find the value of the denominator.
49/98是一个奇特的数，我们错误的直接去掉9约分后，结果竟然是正确的。找出另外3个这样类似的数，求他们乘积的分母。
We shall consider fractions like, 30/50 = 3/5, to be trivial examples.
There are exactly four non-trivial examples of this type of fraction, less than one in value, and containing two digits in the numerator and denominator.
If the product of these four fractions is given in its lowest common terms, find the value of the denominator.
49/98是一个奇特的数，我们错误的直接去掉9约分后，结果竟然是正确的。找出另外3个这样类似的数，求他们乘积的分母。
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