(1), see analysis for the puzzle; (2) Look at the puzzle analysis. The length of the hypotenuse of the largest triangle is.

Test and analysis: (1) According to the properties of similar triangles and 30-degree right triangle.

(2) According to the properties of similar triangles and rectangle.

Problem analysis: (1), the puzzle is as follows:

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(2) The puzzle is as follows:

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The length of the hypotenuse of the largest triangle is.