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对于有些二项式问题,用常规方法解较繁琐或无法直接求解,若能打破常规,采用灵活的方法,往往能将问题准确、顺利地解决.
For some binomial problems, using conventional methods to solve the more cumbersome or can not be directly solved, if you can break the conventional, flexible approach, often can accurately and smoothly solve the problem.