梯子nv官网,梯子合集github

反过来以相对自动扶梯的速度v沿扶梯向下跑至1楼，数得扶梯有n2级根据速度合成n*vv+v#39=n11n*vvv#39=n2221v+v#39vv#39=n2n1n1v+n1v#39=n2vn2v#39v#39=vn2n1n1+n2带入1得到nv2vn2n1+n2=n1梯子有n=2n1n