▲+(1/(1+(1/2)))=2+(1/(1-(1/(2+(1/2))))), then ▲=how much.
▲+(1/(1+(1/2)))=2+(1/(1-(1/(2+(1/2)))))，则▲=多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 + (1/2)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">1 / (5/2)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / (3/5)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">1 / (3/2)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(5/3) - (2/3)</gadget>
<output>1</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<result>3</result>