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例 A(1,1),B(7,4)を結ぶ線分を2:1に内分する点Pの座標

●各座標ごとに考えます

 Pのx座標={1×(1)+2×(7)}/{2+1}=15/3=5
 Pのy座標={1×(1)+2×(4)}/{2+1}=9/3=3

 よって、P(5,3)

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