A and B are two warehouses, take out (1/9) from A warehouse and put it into B warehouse, then the goods in the two warehouses are equal, and it turns out that A is as much as B.
甲乙两个仓库，从甲仓取出(1/9)放入乙仓，则两仓货物相等，原来甲是乙的多少．
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(1/9) * 2</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 - (2/9)</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">1 / (7/9)</gadget>
<output>9/7 = around 1.285714</output>

<result>9/7 = around 1.285714</result>