Calculation: (1/2)+(1/3)+(2/3)+(1/4)+(2/4)ten(3/4)+(1/5)+(2/5)+ …+(49/50).
计算：(1/2)+(1/3)+(2/3)+(1/4)+(2/4)十(3/4)+(1/5)+(2/5)+…+(49/50)．
<gadget id="calculator">1 + 24.5</gadget>
<output>25.5</output>

<gadget id="calculator">49 / 2</gadget>
<output>49/2 = around 24.5</output>

<gadget id="calculator">25.5 * (49/2)</gadget>
<output>624.75</output>

<result>624.75</result>