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Another way to approach the linear combination is to look at it geometrically. This is where the idea of barycentric coordinates can help. A barycentric coordinate system describes the location of a point as the weighted sum of the regular coordinates of the vertices forming a simplex. In other words, it describes a linear combination with respect to a set of points, where in -dimensional space.
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这些动作指向同一个变化：平台被要求把收费、定价与规则从黑箱拉回可解释、可对账、可追责的框架。对OTA来说，这更像一次商业模式压力测试。交易规模趋稳后，增长从做大订单转向提高单位变现，但抽佣与各类附加收费很快触及供给侧现金流边界，于是平台收费模式的再定价不可避免。