Among the numbers 0.{_{2}**(•)}{_{7}**(•)}, 0.27, 0.2788, (2/7), what is the largest one?
在0.{_{2}**(•)}{_{7}**(•)}、0.27、0.2788、(2/7)这几个数中，最大的一个是多少．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

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