If a+b=5, ab=2, (a+b)**2=a**2+2ab+b**2, then a**2+b**2+1=how much.
若a+b=5，a-b=2，(a+b)**2=a**2+2ab+b**2，那么a**2+b**2+1=多少．
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">2 + 2</gadget>
<output>4</output>

<gadget id="calculator">25 + 4</gadget>
<output>29</output>

<gadget id="calculator">29 / 2</gadget>
<output>29/2 = around 14.5</output>

<gadget id="calculator">(29/2) + 1</gadget>
<output>31/2 = around 15.5</output>

<result>31/2 = around 15.5</result>