Two calculations are stipulated: x△y=2x-y, a⊕b=((ab)/2), then 3△(4⊕1)=how much.
现规定两种运算：x△y=2x-y，a⊕b=((a-b)/2)，则3△(4⊕1)=多少．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">6 - (3/2)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>