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一位教师在教学六年制第九册(五年制第七册)求平均数应用题的最后,设计了这样一道练习题。某校学雷锋小组,他们学雷锋做好事,积极主动帮助采茶专业组采集茶叶:┏━━━━━━┳━━━━━┳━━━━━━━┓┃小组┃人数┃总重量(千克) ┃┣━━━━━━╋━━━━━╋━━━━━━━┫┃第一小组┃ 18 ┃ 135 ┃┣━━━━━━╋━━━━━╋━━━━━━━┫┃第二小组┃ 21 ┃ 177 ┃┣━━━━━━╋━━━━━╋━━━━━━━┫┃第三小组┃ 18 ┃ 142 ┃┗━━━━━━┻━━━━━┻━━━━━━━┛这道题的练习,她采用如下三个教学层次: 一、(1)根据上表,把下列问题与相应的算式用
A teacher in the teaching of the sixth year of ninth volumes (five years of the seventh book) the average application questions at the end, designed such an exercise. Lei Feng, a school group, they learn from Lei Feng good deeds, and actively take the initiative to help tea picking professional tea group: ┏ ━ ━ ━ ━ ━ ━ ━ ━ Weight (kg) ┃┣ - ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ The first group ┃ 18 ┃ 135 ┃┣ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ She used the following three levels of teaching: First, according to the above table, the following questions and the corresponding formula use