Among the numbers 0.27, 0._{27}**(•), 0.2_{7}**(•), (2/7), what is the largest one?
在0.27、0._{27}**(•)、0.2_{7}**(•)、(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>