To plow a piece of land, those who plowed this piece of land on the first day (2/5), and those who plowed this piece of land less than the first day (1/15) on the second day, have plowed a fraction of this piece of land in two days Several?
耕一块地，第一天耕了这块地的(2/5)，第二天比第一天少耕这块地的(1/15)，两天一共耕了这块地的几分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(2/5) - (1/15)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) + (2/5)</gadget>
<output>11/15 = around 0.733333</output>

<result>11/15 = around 0.733333</result>