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The average score of students in class 1, 2 and 3 is 83, 87, and 89, respectively, while the average score of all the students together is 86.
Quantity A：The number of students in class 1
Quantity B：The number of students in class 3
Quantity A：The number of students in class 1
Quantity B：The number of students in class 3
A显示答案
以上解析由 考满分老师提供。
