If stipulated 2! =2*3, 3! =3*4*5, 4! =4*5*6*7, calculate ((5!)/(6!)).
若规定2！=2*3，3！=3*4*5，4！=4*5*6*7，计算((5!)/(6!))．
<gadget id="calculator">5 * 6 * 7 * 8 * 9</gadget>
<output>15_120</output>

<gadget id="calculator">6 * 7 * 8 * 9 * 10</gadget>
<output>30_240</output>

<gadget id="calculator">15_120 / 30_240</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>