If a and b are reciprocals of each other, what is the sum of 2ab+3
如果a和b互为倒数，那么2ab+3的和是多少
<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<result>5</result>