(3/4):X=(1/9):2.
(3/4)：X=(1/9)：2．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) * 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(3/2) / (1/9)</gadget>
<output>27/2 = around 13.5</output>

<result>27/2 = around 13.5</result>