[解題] 直角座標系
出處：高中一年級直角座標系
題目為：
A(2,3) B(5,5) 二個座標點，P點位於y軸上，
求PA(線段)^2 + PB(線段)^2的最小值為？
想法：
AB連成一線與y軸相交於P點是最小值
但P點的座標要怎麼算出來呢？
想破頭還是想不出來 >.<
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