Two Taishan forest rangers want to water a forest, A has watered (2/7) of this forest, B has watered (3/7) of this forest, and the two have watered a few parts of this forest Several? How much is left unwatered?
两个泰山护林员要给一片林木浇水，甲浇了这片树林的(2/7)，乙浇了这片树林的(3/7)，两人已经浇了这片树林的几分之几？还剩几分之几没浇？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">1 - (5/7)</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>