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The number of students of class 5B is:
8 : (9 - 7) × 7 = 28 (students)
The number of students of class 5A is:
8 : (9 - 7) × 9 = 36 (students)
10 studens :
5-3=2 parts
1 part
10:2=5 studens
that class has
5x9=45 studens
answer:45 studens
I'm sorry to say that I don't see any mathematical expressions. And you should translate your questions into Vietnamese so all people can answer them.
I am very sorry but I cannot see any numbers to answer your questions