(7/18)/4+(3/7)*(7/18).
(7/18)/4+(3/7)*(7/18)．
<gadget id="calculator">7 / 18</gadget>
<output>7/18 = around 0.388889</output>

<gadget id="calculator">(7/18) / 4</gadget>
<output>7/72 = around 0.097222</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(3/7) * (7/18)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(7/72) + (1/6)</gadget>
<output>19/72 = around 0.263889</output>

<result>19/72 = around 0.263889</result>