The reciprocal of a number is (4/7), what is this number.
一个数的倒数是(4/7)，这个数是多少．
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1 / (4/7)</gadget>
<output>7/4 = around 1.75</output>

<result>7/4 = around 1.75</result>