很基础的问题,大家看看
已知x+y=a;x-y=b;,求X,Y。 
 用程序如何写啊?
------解决方案--------------------public class Jiajianfa //已知x+y=a;x-y=b;,求X,Y 
 { 
 public static void main(String[] args)  
 { 
    int x,y; 
    x=0; 
    y=0; 
    for(x=1;x <1000;x++) 
      { 
      for(y=1;y <1000;y++) 
      { 
        if (x+y==8&&x-y==2) 
        { 
          System.out.println( "X和Y的值分别是: "+x+ "和 "+y); 
 	System.out.println( "哦哦哦 "); 
        } 
      } 
      } 
 }   
 }   
 是这样的吗?
------解决方案--------------------这题贼简单,哈哈 
 package test1; 
 public class Test13 { 
 	public static void count(int a,int b){ 
 		float x,y; 
 		x=(float)(a+b)/2; 
 		y=(float)(a-b)/2; 
 		System.out.println( "x= "+x+ "; "+ "y= "+y); 
 	} 
 	 public static void main(String[] args) { 
 	      count(8,3);  
 	} 
 }
------解决方案--------------------代码如下 
 package test1; 
 public class Test13 { 
 public static void count(int a,int b){ 
 float x,y; 
 x=(float)(a+b)/2; 
 y=(float)(a-b)/2; 
 System.out.println( "x= "+x+ "; "+ "y= "+y); 
 } 
  public static void main(String[] args) { 
       count(8,3);  
 } 
 }   
------解决方案--------------------第一步  输入x值和y值 
 x=a-y;   
 a-2y=b;   
 y=(a-b)/2; 
 print(y); 
 print(a-y);     
 ok?