There is an electric toy formed by a rectangles(8.28cm×5.14cm)and a circle of radius 3cm(with a baby face on it),they connect at Ponint A And E(as in the construction).If the circle rolls from Point A along the rectangular inner wall(no slip).Finally returns to the original position. I.Please sketch the circle with a baby face at Position B,C,D respectively. II.The circle rolls
There is a project,Team A needs 15days to finish it alone and Team B need 12days alone.Team A and Team B work 4days together and Team C can finish the job in 8days.How many days does Team C need if it has to finish the project alone? 一项工程,甲队单独做需要15天完成,乙队单独做12天完成.现在甲乙合作4天后,剩下的工程由丙队8天完成.如果这项工程由丙队独做,需要几天?