这句有什么有关问题么？不知道错在哪

/*
$sql1=$result = SELECT `a1` FROM `tab` WHERE 1;
$sql2=$result = SELECT `a3` FROM `tab` WHERE 1;
$result1=mysql_query($sql1," $con");
$result2=mysql_query($sql2," $con");
$con1=mysql_fetch_array($result 1);
$con2=mysql_fetch_array($result 2);
echo $con1["con"]/$con2["con"];
*/
//太佩服你了，上面这段代码每一行都有错误！！

$sql1 = 'SELECT `a1` FROM `tab` WHERE 1';
$sql2 = 'SELECT `a3` FROM `tab` WHERE 1';
$result1=mysql_query($sql1,$con);
$result2=mysql_query($sql2,$con);
$con1=mysql_fetch_array($result1);
$con2=mysql_fetch_array($result2);
echo $con1['a1'] / $con2['a3'];