Calculation: (4/(2*4))+(4/(4*6))+(4/(6*8))+(4/(8*10))+(4/(10*12) )+...+(4/360).
计算：(4/(2*4))+(4/(4*6))+(4/(6*8))+(4/(8*10))+(4/(10*12))+…+(4/360)．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>