摘要 △ABC在一平面上，P為平面一點，且向量AP=1/5AB+2/5AC，則△ABP/△ABC=?

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A list of all pages that have property “摘要” with value “△ABC在一平面上，P為平面一點，且向量AP=1/5AB+2/5AC，則△ABP/△ABC=?”