Calculate (3(2/3)+1(1/7)*9)/(4-(3/2))-(2(2/3)+(2/7))*(1-(3/ 5)) = how much.
计算(3(2/3)+1(1/7)*9)/(4-(3/2))-(2(2/3)+(2/7))*(1-(3/5))=多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">10 * (2/5)</gadget>
<output>4</output>

<result>4</result>