近期,我校参与了豫南五市高三联考,其中有这样一道题:原题特种兵过山谷的一种方法可化简为如下情境:将一根长为2d的不可伸长的细绳两端固定在相距为d的A、B两等高处,悬绳上有小滑轮P,战士们相互配合,可沿着细绳滑到 Recently, our school participated in the high school entrance exams in five cities of south Henan, among which there was such a question: One of the methods that the original special forces soldier passed the valley can be reduced to the following situation: a long inextensible cord 2d End fixed at a distance d from the A, B two high places, the suspension rope on the small pulley P, the soldiers cooperate with each other, can slide along the thin rope