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排列组合应用题是中学数学的难点,学生解题时往往无从下手,或者经常出现“重复”或“遗漏”现象,而且发生这些差错不易被察觉,产生这些错误
Arranging and combining application problems is a difficult point in middle school mathematics. Students often have no way to solve problems, or often appear as “repeated” or “missing” phenomena, and these errors are not easy to be detected and these errors are generated.