A and B are two seven-digit numbers, how much more is the 7 in A's tens of thousands digit than the 7 in B's thousands digit
甲、乙两个七位数，甲万位上的7比乙千位上的7多多少
<gadget id="calculator">7 * 10_000</gadget>
<output>70_000</output>

<gadget id="calculator">7 * 1_000</gadget>
<output>7_000</output>

<gadget id="calculator">70_000 - 7_000</gadget>
<output>63_000</output>

<result>63_000</result>