How to do the fifth question on page 75 of the first grade mathematics in primary school last semester?

This problem belongs to the addition and subtraction within 10! Addition and subtraction are required, and addition and subtraction cannot be used! And the answer is no more than 10!

Three kinds of animals represent three kinds of column numbers!

Little monkey, 5-2+4=7. Problem solving: There were originally 5 monkeys in the tree on the right-2 monkeys under the tree (3 monkeys left in the tree)+4 monkeys on the tree on the left. There are always seven monkeys in the tree now!

I want to take part in the postgraduate entrance examination of subject mathematics in Capital Normal University. Do you want to ask who will cross-examine you?

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