It is known that 1*3=1*2*3, 4*5=4*5*6*7*8, then (5*4)/(4*4)=how much. (23 questions)
已知1※3=1*2*3，4※5=4*5*6*7*8，那么(5※4)/(4※4)=多少．(23中题)
<gadget id="calculator">5 * 6 * 7 * 8</gadget>
<output>1_680</output>

<gadget id="calculator">4 * 5 * 6 * 7</gadget>
<output>840</output>

<gadget id="calculator">1_680 / 840</gadget>
<output>2</output>

<result>2</result>