piece of rectangular colored paper, Xiao Hua used this colored paper (2/9), Xiao Fang used this colored paper (4/9). How much more did Xiaofang use up the colored paper than Xiaohua.
一张长方形的彩纸，小华用去这张彩纸的(2/9)，小芳用去这张彩纸的(4/9)．小芳比小华多用去这张彩纸的多少．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(4/9) - (2/9)</gadget>
<output>2/9 = around 0.222222</output>

<result>2/9 = around 0.222222</result>