4.5/5.4-(1/2)*0.7.
4.5/5.4-(1/2)*0.7．
<gadget id="calculator">4.5 / 5.4</gadget>
<output>0.833333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 0.7</gadget>
<output>0.35</output>

<gadget id="calculator">0.833333 - 0.35</gadget>
<output>0.483333</output>

<result>0.483333</result>