Use the three numbers 2, 7, 9 and a decimal point to form a largest decimal and a smallest decimal, and find their difference.
用2，7，9这三个数字和一个小数点组成一个最大的小数和一个最小的小数，求出它们的差．
<gadget id="calculator">97.2 - 2.79</gadget>
<output>94.41</output>

<result>94.41</result>