((1+3+5...+101)/(103+105+...+203)).
((1+3+5…+101)/(103+105+…+203))．
<gadget id="calculator">1 + 101</gadget>
<output>102</output>

<gadget id="calculator">51 / 2</gadget>
<output>51/2 = around 25.5</output>

<gadget id="calculator">102 * (51/2)</gadget>
<output>2_601</output>

<gadget id="calculator">103 + 203</gadget>
<output>306</output>

<gadget id="calculator">306 * (51/2)</gadget>
<output>7_803</output>

<gadget id="calculator">2_601 / 7_803</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>