⑩天掌 Teaching Plan on Advanced Mathematics kh krdx 2 依题意知,每次锤击所作的功相等 k Wh=1→-=n n次击入的总深度为=√m, 第I击入的深度为n√n-1 「返回 Tianjin Polytechnic Moiwendity wTianjin Polytechnic University Teaching Plan on Advanced Mathematics  = h h w kxdx 0 , 2 2 kh = 依题意知，每次锤击所作的功相等． wh = nw1  2 2 kh , 2 k = n h = n, n − n − 1. n 次击入的总深度为 第 n 次击入的深度为 返回