(3/(4*7))+(3/(7*10))+(3/(10*13))+(3/(13*16))+…+(3/(58*+61 ))+(3/(61*64))=how much.
(3/(4*7))+(3/(7*10))+(3/(10*13))+(3/(13*16))+…+(3/(58*+61))+(3/(61*64))=多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 64</gadget>
<output>1/64 = around 0.015625</output>

<gadget id="calculator">(1/4) - (1/64)</gadget>
<output>15/64 = around 0.234375</output>

<result>15/64 = around 0.234375</result>