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Mathematical Problems Matchstick Form
This problem is very simple and can be solved by the undetermined coefficient method of linear function.

(1) The number of matchsticks with a big triangle in the nth figure is 3n.

(2) The number of triangles in the nth graph is 3n-2, and the number of triangles in the 200th graph is 598.

(3) The nth number needs 6n-3 matchsticks.

If you want to know the steps, please feel free to join my Q904002473.

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