<script   type="text/javascript">
var n =0;
var s =0;
 for (var a =0 ;a <=20; a ++ ){
      for(var b =0; b<=10;b++){
          for(var c =0; c <=4; c++){
              if(a * 1 + b * 2 +c * 5 ==20){
              n ++;
              s +=(a+"个1元"+b+"个2元"+c+"个5元"+"||")
              }
              
          }
      }
 }alert(n);
   alert(s);
</script>

 

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