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案例《求平均数应用题》教学片断。出示练习题:敬老院里有8个老爷爷和12个老奶奶,老爷爷平均年龄72岁,老奶奶平均年龄68岁,请问:这些老人的平均年龄有多大?
Case “average application problem” teaching piece. Exercises: There are 8 grandmas and 12 grandmas in the nursing home. The average age of the grandpa is 72 and the average age of the grandmother is 68. Excuse me: What is the average age of these elderly people?