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✨ Best Answer ✨

PA,PB,PCの式をAP,AB,ACで表せるように変形します。
PA = -AP
PB = AB-AP
PC = AC-AP なので、
PA+2PB-4PC = 0
-AP+2(AB-AP)-4(AC-AP) = 0
整理して AP = -2AB+4AC

このとき図示すると領域⑦とわかります。

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