108-1800/45+55.
108-1800/45+55．
<gadget id="calculator">1_800 / 45</gadget>
<output>40</output>

<gadget id="calculator">108 - 40</gadget>
<output>68</output>

<gadget id="calculator">68 + 55</gadget>
<output>123</output>

<result>123</result>