We define an operation (a, b)=a*b+ab; #(a, b)=b*ba*b+a*a, then ((4,9), #(3,7))= How many.
我们定义一种运算(a，b)=a*b+a-b；#(a，b)=b*b-a*b+a*a，则((4，9)，#(3，7))=多少．
<gadget id="calculator">31 * 37</gadget>
<output>1_147</output>

<gadget id="calculator">31 - 37</gadget>
<output>-6</output>

<gadget id="calculator">1_147 + (-6)</gadget>
<output>1_141</output>

<result>1_141</result>