1.1+1.3+1.5+1.7+1.9+2.1+...+9.7+9.9．
1.1+1.3+1.5+1.7+1.9+2.1+…+9.7+9.9．
<gadget id="calculator">11 + 99</gadget>
<output>110</output>

<gadget id="calculator">45 / 2 / 10</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">110 * (9/4)</gadget>
<output>495/2 = around 247.5</output>

<result>495/2 = around 247.5</result>