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What is the math problem 14 of the Yangtze river exercise book in the second volume of the third grade?
The topic is: planting 52 trees in two classes in grade four. How many trees are planted in each class in grade four?

This is a problem of writing division.

The average number of plants in each class can be obtained by dividing the total number of plants planted by the total number of classes.

In this problem, 52 divided by 2 equals 26 trees.

So in the fourth grade, each class planted an average of 26 trees.