(4/5)+(3/15)=how much.
(4/5)+(3/15)=多少．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 15</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(4/5) + (1/5)</gadget>
<output>1</output>

<result>1</result>