Calculation: ((5*2**2+5**2*4**2+…+5**(n)*(2**(n))**2)/(5*3**2 +5**2*6**2+...+5**(n)*(2**1*3)**2)).
计算：((5*2**2+5**2*4**2+…+5**(n)*(2**(n))**2)/(5*3**2+5**2*6**2+…+5**(n)*(2**1*3)**2))．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>