The little sloppy mistakenly regards (4+□)*15 as 4+□*15, so the calculated result is much less than the correct result
小马虎将(4+□)*15误看作4+□*15，这样计算的结果比正确结果少多少
<gadget id="calculator">56 + 0</gadget>
<output>56</output>

<result>56</result>