If 2△3=2+3+4=9, 5△4=5+6+7+8=26. According to this rule, 5△5=how much.
若2△3=2+3+4=9，5△4=5+6+7+8=26．按此规律，5△5=多少．
<gadget id="calculator">5 + 6 + 7 + 8 + 9</gadget>
<output>35</output>

<result>35</result>