Calculation: ((1/2)+(2/3)+(3/4)+(4/5)+(5/6)+(6/7))**2+((1/2)+ (2/3)+(3/4)+(4/5)+(5/6)+(6/7))*(1/2)-(1+(1/2)+(2/3 )+(3/4)+(4/5)+(5/6)+(6/7))*((2/3)+(3/4)+(4/5)+(5/6 )+(6/7))=How much.
计算：((1/2)+(2/3)+(3/4)+(4/5)+(5/6)+(6/7))**2+((1/2)+(2/3)+(3/4)+(4/5)+(5/6)+(6/7))*(1/2)-(1+(1/2)+(2/3)+(3/4)+(4/5)+(5/6)+(6/7))*((2/3)+(3/4)+(4/5)+(5/6)+(6/7))=多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">(1/2) + (2/3) + (3/4) + (4/5) + (5/6) + (6/7)</gadget>
<output>617/140 = around 4.407143</output>

<gadget id="calculator">(617/140) ** 2</gadget>
<output>380_689/19_600 = around 19.422908</output>

<gadget id="calculator">(617/140) * (1/2)</gadget>
<output>617/280 = around 2.203571</output>

<gadget id="calculator">1 + (1/2) + (2/3) + (3/4) + (4/5) + (5/6) + (6/7)</gadget>
<output>757/140 = around 5.407143</output>

<gadget id="calculator">(2/3) + (3/4) + (4/5) + (5/6) + (6/7)</gadget>
<output>547/140 = around 3.907143</output>

<gadget id="calculator">(757/140) * (547/140)</gadget>
<output>414_079/19_600 = around 21.12648</output>

<gadget id="calculator">(617/280) - (414_079/19_600)</gadget>
<output>-370_889/19_600 = around -18.922908</output>

<gadget id="calculator">(380_689/19_600) + (-370_889/19_600)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>