We have learned the four operations "+", "one", "*" and "/". It is now stipulated that "*" is a new operation: A*B=2A-B, such as 4*3=4*2-3=5. So how much is 3*4=.
我们学过"+""一""*""/"这四种运算．现在规定"*"是一种新的运算：A*B=2A-B，如4*3=4*2-3=5．那么3*4=多少．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<result>2</result>