((8/9)+(4/27))*27,87*(3/86)(5/7)*16*(21/5).
((8/9)+(4/27))*27,87*(3/86)(5/7)*16*(21/5)．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">21 / 5</gadget>
<output>21/5 = around 4.2</output>

<gadget id="calculator">(5/7) * (21/5) * 16</gadget>
<output>48</output>

<result>48</result>