(9/2): x=2(4/7): 0.5.
(9/2)：x=2(4/7)：0.5．
<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">7 / 18</gadget>
<output>7/18 = around 0.388889</output>

<gadget id="calculator">(9/2) * 0.5 * (7/18)</gadget>
<output>0.875</output>

<gadget id="calculator">18 / 7</gadget>
<output>18/7 = around 2.571429</output>

<gadget id="calculator">(18/7) * (7/18)</gadget>
<output>1</output>

<gadget id="calculator">0.875 / 1</gadget>
<output>0.875</output>

<result>0.875</result>