((9/5)+(2/9)*how much)/(14/5)=1.
((9/5)+(2/9)*多少)/(14/5)=1．
<gadget id="calculator">14 / 5</gadget>
<output>14/5 = around 2.8</output>

<gadget id="calculator">1 * (14/5)</gadget>
<output>14/5 = around 2.8</output>

<gadget id="calculator">9 / 5</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">(14/5) - (9/5)</gadget>
<output>1</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 / (2/9)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>