"Little sloppy" miscalculated 30*(□+2) as 30*□+2, how much difference is the result obtained from the correct answer.
"小马虎"把30*(□+2)错算成30*□+2，这样得到的结果与正确答案相差多少．
<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">60 - 2</gadget>
<output>58</output>

<result>58</result>