(7/8)*(4/7)*8; ((7/8)-(21/32))/(7/8), (13/27)*8+(19/27)*13.
(7/8)*(4/7)*8；((7/8)-(21/32))/(7/8)，(13/27)*8+(19/27)*13．
<gadget id="calculator">13 / 27</gadget>
<output>13/27 = around 0.481481</output>

<gadget id="calculator">(13/27) * 8</gadget>
<output>104/27 = around 3.851852</output>

<gadget id="calculator">(13/27) * 19</gadget>
<output>247/27 = around 9.148148</output>

<gadget id="calculator">(104/27) + (247/27)</gadget>
<output>13</output>

<result>13</result>