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Who can tell me the answer and solution to the math problem in grade three (it seems to be the problem of Beijing Chaoyang No.2 model 20 12)?
If it's Beijing's problem, then use the method of limiting cards!
Let the ordinate of point P be infinite, then n=0 m=0, but there is no triangle at this time, and only a hollow circle can be used.
Let the abscissa of point P be infinite, then n infinity is close to 0 m infinity.