((1*2*3+2*4*6+...+100*200*300)/(2*3*4+4*6*8+...+200*300*400)).
((1*2*3+2*4*6+…+100*200*300)/(2*3*4+4*6*8+…+200*300*400))．
<gadget id="calculator">1 * 2 * 3</gadget>
<output>6</output>

<gadget id="calculator">2 * 3 * 4</gadget>
<output>24</output>

<gadget id="calculator">6 / 24</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>