Choose eight numbers from the nine numbers 1 to 9 and fill them in the eight ○s below to make the calculation result as large as possible. Your result is (○/○*(○+○))-(○*○ +○-○)=how much.
从1～9这九个数中选出八个数分别填入下面八个○中，使算式结果尽可能大，你的结果是(○/○*(○+○))-(○*○+○-○)=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>