Through the examples, it is illustrated that different selections of a particle have great efferts on the degrees of difficulty in solving a problem.
同时通过例解说明，动点选择的优劣，会对解题的易、难，带来极大的差异。
Through the examples, it is illustrated that different selections of a particle have great efferts on the degrees of difficulty in solving a problem.
同时通过例解说明，动点选择的优劣，会对解题的易、难，带来极大的差异。
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