1 kg (2/9) weighs the same as how many kg (1/9).
1kg的(2/9)和多少kg的(1/9)一样重．
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

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

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

<result>2</result>