According to 120-60=60,60/30=2, how many comprehensive formulas can be listed
根据120-60=60,60/30=2可列综合算式多少
<gadget id="calculator">120 - 60</gadget>
<output>60</output>

<gadget id="calculator">60 / 30</gadget>
<output>2</output>

<result>2</result>