How much more the smallest four-digit number composed of 0, 2, 7, and 9 is than the largest three-digit number.
用0、2、7、9组成的最小四位数比最大三位数多多少．
<gadget id="calculator">2_079 - 972</gadget>
<output>1_107</output>

<result>1_107</result>