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The answers to the exercises on the fourth page of the first volume of the eighth grade mathematics textbook published by People's Education Press.
Answer: People's Education Edition, eighth grade mathematics textbook, Volume 1, page 4, exercise answer:

1. Solution: There are five triangles, namely △ Abe, △ABC, △BEC, △ BDC and △ EDC.

2. Solution: (1) No; (2) can't; (3) Yes. The reason is omitted.

Bian Xiao suggested:

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