What is the reciprocal of the product of the largest true fraction whose unit of fraction is (1/7) and (7/9)?
分数单位是(1/7)的最大真分数与(7/9)的积的倒数是多少？
<gadget id="calculator">7 / 1</gadget>
<output>7</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">(6/7) * (7/9)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / (2/3)</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>