(3/5)*(4+(0.5+(1/4))).
(3/5)*(4+(0.5+(1/4)))．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">0.5 + (1/4)</gadget>
<output>0.75</output>

<gadget id="calculator">4 + 0.75</gadget>
<output>4.75</output>

<gadget id="calculator">(3/5) * 4.75</gadget>
<output>2.85</output>

<result>2.85</result>