Use the four numbers 1, 0, 3, and 8 to count: How much more is the largest even number formed by these four numbers than the largest odd number? How many.
用1、0、3、8这四个数字组数：这四个数字组成的最大偶数比最大奇数多多少？多少．
<gadget id="calculator">8_310 - 8_301</gadget>
<output>9</output>

<result>9</result>