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一、提出问题阶段:充分运用已有经验【片断一】出示例题:小明和哥哥去参观科技馆。有10张门票,如果小明想取出连号的两张票,一共有多少种不同的拿法?
First, the question stage: make full use of existing experience [piece] to produce examples: Xiao Ming and his brother to visit science and technology museum. There are 10 tickets, if Xiaoming want to take out even two tickets, a total of how many different take law?