255/255(255/699)-477/477(477/699)=how much.
255/255(255/699)-477/477(477/699)=多少．
<gadget id="calculator">699 / 700</gadget>
<output>699/700 = around 0.998571</output>

<gadget id="calculator">(699/700) + (699/700)</gadget>
<output>699/350 = around 1.997143</output>

<result>699/350 = around 1.997143</result>