When Wang Lin reads a book, he reads the whole book on the first day (2/9), and reads more of the book on the second and third day than on the first day (4/27). After three days, he still has a few points of the whole book How long have you not seen it?
王林看一本书，第一天看了全书的(2/9)，第二天和第三天都比第一天多看全书的(4/27)，三天后还剩全书的几分之几没看？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">4 / 27</gadget>
<output>4/27 = around 0.148148</output>

<gadget id="calculator">(2/9) + (4/27)</gadget>
<output>10/27 = around 0.37037</output>

<gadget id="calculator">1 - (2/9) - (10/27) - (10/27)</gadget>
<output>1/27 = around 0.037037</output>

<result>1/27 = around 0.037037</result>