A tractor plows 4.92 hectares in the morning, and 0.94 hectares less in the afternoon than in the morning. How many hectares does this tractor plow in total?
一台拖拉机上午耕地4.92公顷，下午比上午少耕0.94公顷．这台拖拉机这天一共耕地多少公顷？
<gadget id="calculator">4.92 - 0.94</gadget>
<output>3.98</output>

<gadget id="calculator">4.92 + 3.98</gadget>
<output>8.9</output>

<result>8.9</result>