Choose the appropriate symbols from "+, -, *, /, how much", and fill in the appropriate place in the following formula to make the equation true: 9,9,9,9,9=22.
从"+、-、*、/、多少"中，挑选合适符号，填入下列算式合适地方，使等式成立：9,9,9,9,9=22．
<gadget id="calculator">99 + 99</gadget>
<output>198</output>

<gadget id="calculator">198 / 9</gadget>
<output>22</output>

<result>22</result>