(5/4)*(4/3)*(3/2)*(2/1)=how much.
(5/4)*(4/3)*(3/2)*(2/1)=多少．
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

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

<gadget id="calculator">(5/4) * (4/3) * (3/2) * 2</gadget>
<output>5</output>

<result>5</result>