When a classmate calculated a-34.6+7.2, he miscalculated as a-34.6+72. What is the difference between the result of this calculation and the correct result?
一个同学在计算a-34.6+7.2时，错算成a-34.6+72，这样算的结果和正确结果相比，有什么变化？
<gadget id="calculator">72 - 7.2</gadget>
<output>64.8</output>

<result>64.8</result>