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在解题学习中,经常会遇到组合计数的问题.解决此类问题的关键是确定分类标准,按顺序进行组合计数才会得到不重不漏的正确答案.下面的这道练习题,是我们在学习了人教版七年级数学第七章第一节《三角形的边》后
In solving problem-solving learning, often encounter the problem of combinatorial counting.The key to solve such problems is to determine the classification criteria, in order to be combinatorial count will not get the correct answer.The following exercise in this exercise is We are learning PEP seventh grade mathematics seventh chapter first section “triangle side”