38*29, if 38 is reduced by 2, the product will be reduced by how much.
38*29，如果38减小2，积就减小多少．
<gadget id="calculator">38 * 29</gadget>
<output>1_102</output>

<gadget id="calculator">36 * 29</gadget>
<output>1_044</output>

<gadget id="calculator">1_102 - 1_044</gadget>
<output>58</output>

<result>58</result>