摘要：
public class AverageSpeed{ public static void main(String[]args){ double speedkm =60/(45.5/14); double speedm = speedkm /1.6; system.out.println（“aver 阅读全文
摘要：
private final double PI=3.1415; public double accountGirth(double r){ return 2*PI*5.5;}public double accountArea(double r){ return PI*5.5*5.5;} 阅读全文