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参考・概略です

 A(1,0),P(0,1)なので,三平方の定理から
  AP²={(0)-(1)}²+{(1)-(0)}²=(-1)²+(1)²=1+1=2

 A(1,0),Q(-1,0)なので,三平方の定理から
  AQ²={(-1)-(1)}²+{(0)-(0)}²=(-2)²+(0)²=4+0=4

 AP²+AQ²=2+4=6

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