Use 4, 1, 2 and a decimal point to form a largest decimal and a smallest decimal, what is the difference between them.
用4、1、2和小数点组成一个最大的小数和一个最小的小数，他们的差是多少．
<gadget id="calculator">42.1 - 1.24</gadget>
<output>40.86</output>

<result>40.86</result>