When the little sloppy calculates 0.8*(□+9), he mistakenly calculates it as 0.8*□+9, how much is the difference between the result he gets and the correct result?
小马虎在计算0.8*(□+9)时，误当成0.8*□+9来算了，则他得到的结果与正确结果相差多少？
<gadget id="calculator">0.8 * 9</gadget>
<output>7.2</output>

<gadget id="calculator">9 - 7.2</gadget>
<output>1.8</output>

<result>1.8</result>