(1/21)+(202/2121)+(50505/212121)+(13131313/21212121)=how much.
(1/21)+(202/2121)+(50505/212121)+(13131313/21212121)=多少．
<gadget id="calculator">1 / 21</gadget>
<output>1/21 = around 0.047619</output>

<gadget id="calculator">202 / 2_121</gadget>
<output>2/21 = around 0.095238</output>

<gadget id="calculator">50_505 / 212_121</gadget>
<output>5/21 = around 0.238095</output>

<gadget id="calculator">13_131_313 / 21_212_121</gadget>
<output>13/21 = around 0.619048</output>

<gadget id="calculator">(1/21) + (2/21) + (5/21) + (13/21)</gadget>
<output>1</output>

<result>1</result>