Maths Olympiad – 不定方程

Here is an intro of “what is 不定方程”:

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And I find the “交叉增量法” very useful.

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Some basic methods/tips when tackling 不定方程 questions:

Also, you can use 整数分离法 to solve this kind of problems, as depicted below:

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Watch this video for further explanation:

Resources:

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