Calculation: (1/(1*2))+(1/(2*3))+(1/(3*4))+...+(1/(44*45))=how much.
计算：(1/(1*2))+(1/(2*3))+(1/(3*4))+…+(1/(44*45))=多少．
<gadget id="calculator">1 / 45</gadget>
<output>1/45 = around 0.022222</output>

<gadget id="calculator">1 - (1/45)</gadget>
<output>44/45 = around 0.977778</output>

<result>44/45 = around 0.977778</result>