Calculation: 30+(3-8)**2-20=how much.
计算：30+(3-8)**2-20=多少．
<gadget id="calculator">(-5) ** 2</gadget>
<output>25</output>

<gadget id="calculator">25 - 20</gadget>
<output>5</output>

<gadget id="calculator">30 + 5</gadget>
<output>35</output>

<result>35</result>