计算x/y

<?php

for($i = 7; $i <= 10; $i ++) {
    for($j = 0; $j < 100; $j++) {
        $y = "{$i}.{$j}";
        $x = (44655.42 - 1597.2 * $y)/192;
        if(preg_match('#^\d+\.\d{2}$#', (string)$x)) {
            echo "x:{$x} y:{$y}\n";
        }
    }
}