Student A is 3cm taller than the average height of the whole class, recorded as +3cm, and student B's height is -2cm, what is the height difference between A and B in cm
甲学生高出全班平均身高3cm，记作+3cm，乙学生的身高为-2cm，甲乙身高差为多少cm
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<result>5</result>