It is known that 1*4=1*2*3*4, 6*5=6*7*8*9*10, then (4*4)/(5*5)=how much.
已知1*4=1*2*3*4，6*5=6*7*8*9*10，那么(4*4)/(5*5)=多少．
<gadget id="calculator">4 * 5 * 6 * 7</gadget>
<output>840</output>

<gadget id="calculator">5 * 6 * 7 * 8 * 9</gadget>
<output>15_120</output>

<gadget id="calculator">840 / 15_120</gadget>
<output>1/18 = around 0.055556</output>

<result>1/18 = around 0.055556</result>