(1+(7/11))+(2+(7/11)*2)+(3+(7/11)*3)+...+(10+(7/11)*10)=how much.
(1+(7/11))+(2+(7/11)*2)+(3+(7/11)*3)+…+(10+(7/11)*10)=多少．
<gadget id="calculator">18 / 11</gadget>
<output>18/11 = around 1.636364</output>

<gadget id="calculator">55 * (18/11)</gadget>
<output>90</output>

<result>90</result>