For a one-digit decimal, if the decimal point is removed, it will increase by 45.9. What is the decimal?
一个一位小数，如果去掉小数点就比原来增加45.9，这个小数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">45.9 / 9</gadget>
<output>5.1</output>

<result>5.1</result>