Given: a=12, b=3, find the value of ((2a+b)/(ab)).
已知：a=12，b=3，求((2a+b)/(a-b))的值．
<gadget id="calculator">2 * 12</gadget>
<output>24</output>

<gadget id="calculator">24 + 3</gadget>
<output>27</output>

<gadget id="calculator">12 - 3</gadget>
<output>9</output>

<gadget id="calculator">27 / 9</gadget>
<output>3</output>

<result>3</result>