(2/3)*(5/6)*(6/7)=how much.
(2/3)*(5/6)*(6/7)=多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

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

<gadget id="calculator">(2/3) * (5/6) * (6/7)</gadget>
<output>10/21 = around 0.47619</output>

<result>10/21 = around 0.47619</result>