How to do the last question on page 1 1 of the first volume of fifth grade mathematics?

1 First, prepare the Yangtze River exercise book and gel pen for the first volume of grade five.

2. Secondly, turn to 1 1 and find the last question on this page.

3. Finally, according to the meaning of the question, write the corresponding formula at the bottom of the question with a neutral pen, and bring the value of the question into the equation.

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