Calculation: 19961997*19971996-19961996*19971997=how much.
计算：19961997*19971996-19961996*19971997=多少．
<gadget id="calculator">19_961_997 * 19_971_996</gadget>
<output>398_680_924_236_012</output>

<gadget id="calculator">19_961_996 * 19_971_997</gadget>
<output>398_680_924_226_012</output>

<gadget id="calculator">398_680_924_236_012 - 398_680_924_226_012</gadget>
<output>10_000</output>

<result>10_000</result>