Calculation: 97*98-96*99.
计算：97*98-96*99．
<gadget id="calculator">97 * 98</gadget>
<output>9_506</output>

<gadget id="calculator">96 * 99</gadget>
<output>9_504</output>

<gadget id="calculator">9_506 - 9_504</gadget>
<output>2</output>

<result>2</result>