For a batch of goods, all (4/7) is transported in the first time, and all (1/7) are transported in the second time, what fraction of the goods are transported in total in the two times? How much is left undelivered?
一批货物，第一次运走全部的(4/7)，第二次运走全部的(1/7)，两次一共运走这批货物的几分之几？还剩几分之几没运走？
<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>