A tractor plowed 3.96 hectares in the morning, but it plowed 0.87 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3.96公顷，下午比上午少耕了0.87公顷．这台拖拉机全天一共耕地多少公顷？
<gadget id="calculator">3.96 - 0.87</gadget>
<output>3.09</output>

<gadget id="calculator">3.96 + 3.09</gadget>
<output>7.05</output>

<result>7.05</result>