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故a、b、c三数中必有两个互为相反数。 这是一个很重要的命题,运用它来解有关的数学问题,显得十分简捷。 一、解方程
Therefore, there must be two opposite numbers in the three numbers a, b, and c. This is a very important proposition. It is very simple to use it to solve related mathematical problems. First, solve the equation