What is (3/4) of (4/9), and ((())/(())) of (2/3) is (4/7).
(4/9)的(3/4)是多少，(2/3)的((())/(()))是(4/7)．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>