Choose three numbers from the four numbers 0, 2, 5, and 7 to form a largest three-digit number and a smallest three-digit number respectively, and calculate the difference between them.
从0，2，5，7这四个数字中选三个数字，分别组成一个最大的三位数和一个最小的三位数，并计算它们相差多少．
<gadget id="calculator">752 - 205</gadget>
<output>547</output>

<result>547</result>