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The answers to the exercises on the third page of the first volume of the seventh grade mathematics textbook published by People's Education Press.
Answer: The third page of the first volume of the seventh grade mathematics textbook published by People's Education Press answers to the exercises:

1.20 10 year is+108.7mm; In 2009, it was-81.5 mm; In 2008, it was+53.5mm.

2. The object moved again-1 m, that is to say, the object moved to the left 1 m, and then the object returned to its original position.

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