What is the difference between the largest three-digit number and the smallest three-digit number composed of three numbers 4, 5, and 6?
用4、5、6三个数字组成的最大三位数与最小三位数，它们的差是多少．
<gadget id="calculator">654 - 456</gadget>
<output>198</output>

<result>198</result>