The tractor plowed the land, plowed (1/4) on the first day, and plowed the rest (1/3) on the second day, leaving 3.6 hectares in the end. How many hectares did this land have?
拖拉机耕地，第一天耕了(1/4)，第二天又耕了余下的(1/3)，最后还剩下3.6公顷，这块地原来有多少公顷？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(3/4) * (1/3)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4) - (1/4)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3.6 / (1/2)</gadget>
<output>7.2</output>

<result>7.2</result>