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Science lovers attend the fourth phase of Mathematics Beijing Normal University in the eighth grade.
Very simple

Because point p is where it is,

Pr+pq has value.

Then we will find the limit case, which makes point P and point C coincide.

Therefore, it is concluded that PR is the height on the hypotenuse of Rt△BCD.

30*40=50*PR

PR=24

PR+PQ=24

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