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People's Education Press, the fourth grade, Volume II, Basic Mathematics Training, Chapter V Triangle Exercise 15 (1) Answer
Answer: basic garden

1 and (1) line segments are connected end to end; stable

(2) three; Third; three

(3) vertical line; Opposite; basis

2. Figures 2, 4 and 5 are triangles.

3. Omission

4. Road

Extended space

1, wrong; eight

2、 1,3,6, 10

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