0.1+0.3+0.5+...+99.7+99.9=how much.
0.1+0.3+0.5+…+99.7+99.9=多少．
<gadget id="calculator">0.1 + 99.9</gadget>
<output>100</output>

<gadget id="calculator">500 / 2</gadget>
<output>250</output>

<gadget id="calculator">100 * 250</gadget>
<output>25_000</output>

<result>25_000</result>