Xinmin Village planted 2,120 trees this year, and 380 fewer trees were planted last year than this year. How many trees were planted in two years?
新民村今年植树2120棵，去年比今年少植树380棵．两年共植树多少棵？
<gadget id="calculator">2_120 - 380</gadget>
<output>1_740</output>

<gadget id="calculator">2_120 + 1_740</gadget>
<output>3_860</output>

<result>3_860</result>