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An unsolvable mathematical problem
This problem belongs to piecewise function, which can be done in junior high school. It is estimated that there are two situations to do the first.

That is, △PQR is completely within the triangle △ABC. At this time, the overlapping part is the area of △PQR, and △ ∠A = 30° Let AP = X.

You can get the bottom pq of △PQR = x/2. The height here is 3 times X/4 of the root number, so the area Y= 3 times x the square of the root number/16. At this time, the value range of x is 0 < x < 5.

Focus on the second case, because it is not easy to draw. Take your time and look at the value of x at this time. five

You can get Y= (- root number 3 times the square of x+15 times root number 3 times X-50 times root number 3 )/2. It's really difficult to type out ordinary forms by yourself (5