In 158-27+54/9, if you need to calculate the addition first, then the division and finally the subtraction, please add parentheses at the appropriate place according to the order of operations, and write this formula on the horizontal line behind. How many.
在158-27+54/9，如果需要先算加法再算除法最后算减法，请你按照这个运算顺序在合适的地方加上括号，在后面横线上写出这个算式．多少．
<gadget id="calculator">27 + 54</gadget>
<output>81</output>

<gadget id="calculator">81 / 9</gadget>
<output>9</output>

<gadget id="calculator">158 - 9</gadget>
<output>149</output>

<result>149</result>