A tractor cultivates 3.96 hectares in the morning, which is 0.98 hectares less than in the afternoon. How many hectares of arable land are there in total?
一台拖拉机上午耕地3.96公顷，比下午少耕地0.98公顷．这天一共耕地多少公顷？
<gadget id="calculator">3.96 + 0.98</gadget>
<output>4.94</output>

<gadget id="calculator">3.96 + 4.94</gadget>
<output>8.9</output>

<result>8.9</result>