Simple calculation: 15*7*((1/3)+(1/5)).
简便计算：15*7*((1/3)+(1/5))．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) + (1/5)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">15 * 7 * (8/15)</gadget>
<output>56</output>

<result>56</result>