Fill in the four ports of 10, 10, 10, 10, and 10 with "+""-""*""/" operation symbols, what is the maximum value of the resulting formula?
在10口10口10口10口10的四个口中填入"+""-""*""/"运算符号各一个，所成的算式的最大值是多少
<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">10 / 10</gadget>
<output>1</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">100 + 9</gadget>
<output>109</output>

<result>109</result>