(6/7) kilogram is less than (1/3) kilogram.
(6/7)千克比多少千克少(1/3)千克．
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(6/7) + (1/3)</gadget>
<output>25/21 = around 1.190476</output>

<result>25/21 = around 1.190476</result>