The minuend remains the same, the subtrahend increases by 3, how much is the difference reduced
被减数不变，减数增加3，得到的差减少多少
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">10 - 4</gadget>
<output>6</output>

<gadget id="calculator">9 - 6</gadget>
<output>3</output>

<result>3</result>