Xiaohong brought a piece of colored paper, the origami crane used up (2/9) of this paper, and the origami lucky star used up (5/9) of this paper, and there is still a fraction of this paper ?
小红拿来一张彩纸，折纸鹤用去了这张纸的(2/9)，折幸运星用去了这张纸的(5/9)，还剩下这张纸的几分之几？
<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>

<gadget id="calculator">1 - (7/9)</gadget>
<output>2/9 = around 0.222222</output>

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