(4/5)-(1/6)+(3/10).
(4/5)-(1/6)+(3/10)．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(4/5) - (1/6)</gadget>
<output>19/30 = around 0.633333</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(19/30) + (3/10)</gadget>
<output>14/15 = around 0.933333</output>

<result>14/15 = around 0.933333</result>