The toy workshop plans to complete the processing task of a batch of toys in three weeks. In the first week (2/7) of this batch of toys was produced, and in the second week the same amount was produced as in the first week. To complete the task on time, the third week must What fraction of this batch of toys is produced?
玩具车间计划三周完成一批玩具的加工任务，第一周生产了这批玩具的(2/7)，第二周生产的与第一周同样多，要想按时完成任务，第三周要生产这批玩具的几分之几？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7) - (2/7)</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>