123434 - 経済統計練習帳

 math;
 
import org.apache.commons.math3.geometry.euclidean.twod.Vector2D;
 
 
class pro{
 
public static void main(String[] args) { 
pro test=new pro();
}
 
pro(){
 
 
    Vector2D a=new Vector2D(4,5);
 
 
 
 
 
}
}