时钟敲了5下，用8秒钟，敲10下需要几秒？.G;~'K(d+C(]8k2P-E){
算式：提示'_8r3H/v:l6v.G;~'K(d+C(]8k2P-E){
答：敲10下需要:q:Q-S/h8x/S秒。.G;~'K(d+C(]8k2P-E){