Calculation: (1-(3/(3*5)))*(1-(3/(4*6)))*…*(1-(3/(7*9))).
计算：(1-(3/(3*5)))*(1-(3/(4*6)))*…*(1-(3/(7*9)))．
<gadget id="calculator">12 / 15</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">21 / 24</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">32 / 35</gadget>
<output>32/35 = around 0.914286</output>

<gadget id="calculator">45 / 48</gadget>
<output>15/16 = around 0.9375</output>

<gadget id="calculator">60 / 63</gadget>
<output>20/21 = around 0.952381</output>

<gadget id="calculator">(4/5) * (7/8) * (32/35) * (15/16) * (20/21)</gadget>
<output>4/7 = around 0.571429</output>

<result>4/7 = around 0.571429</result>