18*(3/7)+0.65*(8/13)-(2/7)*18+(5/13)*0.65=how much.
18*(3/7)+0.65*(8/13)-(2/7)*18+(5/13)*0.65=多少．
<gadget id="calculator">18 / 7</gadget>
<output>18/7 = around 2.571429</output>

<gadget id="calculator">13 / 50</gadget>
<output>13/50 = around 0.26</output>

<gadget id="calculator">(18/7) + (13/50)</gadget>
<output>991/350 = around 2.831429</output>

<result>991/350 = around 2.831429</result>