If a*(3/4)=b/(4/5)=(1/2), what is the ratio of a:b?
如果a*(3/4)=b/(4/5)=(1/2)，那么a：b的比值是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(1/2) * (4/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/2) / (3/4) / (2/5)</gadget>
<output>5/3 = around 1.666667</output>

<result>5/3 = around 1.666667</result>