We have learned +, -, *, / these four operations. It is now stipulated that "*" is a new operation. A*B means 2A-B. Such as: 4*3=4*2-3=5. Then 9*6=how much.
我们学过+、-、*、/这四种运算．现在规定"*"是一种新的运算．A*B表示2A-B．如：4*3=4*2-3=5．那么9*6=多少．
<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<gadget id="calculator">18 - 6</gadget>
<output>12</output>

<result>12</result>