Move the decimal point of 0.5 one place to the left, and the result is reduced by how much.
把0.5的小数点向左移动一位，结果比原数减少了多少．
<gadget id="calculator">0.5 - 0.05</gadget>
<output>0.45</output>

<gadget id="calculator">0.45 / 0.5</gadget>
<output>0.9</output>

<result>0.9</result>