A pile of sand, the engineering team uses up (2/9) every day, 3 days share ((())/(())) to remove this pile of sand.
一堆沙，工程队每天用去(2/9)，3天共用去这堆沙的((())/(()))．
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(2/9) * 3</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>