The weight of each term is given by the proportion of each sub-triangle area with respect to the total triangle area . Algebraically, this can be expressed like so:
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Officials at Elon Musk's company said the upper stage was lost after problems developed after lift-off from Texas on Thursday.
// 易错点4：栈空时返回1而非i+1 → 仅i=0时正确，i0时（如i=3）会返回1而非4。关于这个话题，51吃瓜提供了深入分析