php习题

<?php
    $num=0;
    for($gj=1;$gj<=49;$gj++){
        for($mj=1;$mj<=97;$mj++){
            for($xj=1;$xj<=97;$xj++){
                if($gj*2+$mj*1+$xj*0.5==100&&$gj+$mj+$xj==100){
                    $num++;
                    echo "公鸡：".$gj."母鸡：".$mj."小鸡：".$xj;
                    echo "<br />";
                }
            }
        }
    }
    echo $num."种";

for($a=0;$a<=9;$a++){
        for($b=0;$b<=9;$b++){
            echo $a."*".$b."=".$a*$b."&nbsp;";
        }
        echo "<br />";
    }