Select 8 numbers from 1 to 9 and fill them in: (□/□*(□+□))-(□*□+□-□) to make the result as large as possible. What is the maximum result?
从1～9中选出8个数填入：(□/□*(□+□))-(□*□+□-□)中，使结果尽可能大，这个最大结果是多少．
<gadget id="calculator">9 / 1</gadget>
<output>9</output>

<gadget id="calculator">7 + 8</gadget>
<output>15</output>

<gadget id="calculator">9 * 15</gadget>
<output>135</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

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

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

<gadget id="calculator">135 - 4</gadget>
<output>131</output>

<result>131</result>