2004*20032002-2002*20032004=how much.
2004*20032002-2002*20032004=多少．
<gadget id="calculator">2_004 * 20_030_000</gadget>
<output>40_140_120_000</output>

<gadget id="calculator">2_002 * 20_030_000</gadget>
<output>40_100_060_000</output>

<gadget id="calculator">40_140_120_000 - 40_100_060_000</gadget>
<output>40_060_000</output>

<gadget id="calculator">2_004 * 2_002</gadget>
<output>4_012_008</output>

<gadget id="calculator">2_002 * 2_004</gadget>
<output>4_012_008</output>

<gadget id="calculator">4_012_008 - 4_012_008</gadget>
<output>0</output>

<gadget id="calculator">40_060_000 + 0</gadget>
<output>40_060_000</output>

<result>40_060_000</result>