Qiqi reads a storybook, and has already read the whole book (2/9), how much of it is left unread?
琦琦看一本故事书，已经看了全书的(2/9)，还剩几分之几没有看？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

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

<result>7/9 = around 0.777778</result>