A rectangular piece of colored paper, Xiaohua used (2/9) of this colored paper, and Xiaofang used (5/9) of this colored paper. How much did the two share this colored paper?
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(5/9)．两人一共用去这张彩纸的多少．
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(2/9) + (5/9)</gadget>
<output>7/9 = around 0.777778</output>

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