((4/7)*((3/5)-0.25)+(3/10))/(1/2).
((4/7)*((3/5)-0.25)+(3/10))/(1/2)．
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) - 0.25</gadget>
<output>0.35</output>

<gadget id="calculator">(4/7) * 0.35</gadget>
<output>0.2</output>

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

<gadget id="calculator">0.2 + (3/10)</gadget>
<output>0.5</output>

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

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

<result>1</result>