(3/4): (5/6) = x: (2/3).
(3/4)：(5/6)=x：(2/3)．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(3/4) * (2/3)</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) / (5/6)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>