Quick calculation: 123456789*987654321-123456788*987654320.
快速计算：123456789*987654321-123456788*987654320．
<gadget id="calculator">123_456_789 * 987_654_321</gadget>
<output>121_932_631_112_635_269</output>

<gadget id="calculator">123_456_788 * 987_654_320</gadget>
<output>121_932_630_001_524_160</output>

<gadget id="calculator">121_932_631_112_635_269 - 121_932_630_001_524_160</gadget>
<output>1_111_111_109</output>

<result>1_111_111_109</result>