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Recommend a good math problem
Divide the trapezoid into three triangles so that their area ratio is 1: 2: 3. (drawing)

Answer: A triangle can be obtained by extending and intersecting two non-parallel sides of a trapezoid.

Divide the parallel long sides of the trapezoid into three segments of 1: 2: 3.

Two points connecting the top and bottom of a triangle.

That's good.

Extra lines can be erased or dotted.