Mathematics
Senior High
2AP=BPが4AP*2=BP*2になるのはなぜですか？
+4
ゆえに、点Pの軌跡は
直線 x = -1
209 (1) 点Pの座標を (x, y) とする。
AP BP 1:2
よって
2AP = BP
4AP² = BP²
4{(x-3)+ y²) = (x-6)² + y²
4x²-24x+36+4y²
= x²-12x+36+ y²
3x+3y2-12x = 0
x²+ y²-4x=0
(x-2)²+ y² = 4
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