Xiaoxiao read extracurricular books, read the whole book on the first day (1/10), read the whole book on the second day (1/5), and read the whole book on the third day (3/10), how many points are left after three days How much?
笑笑看课外书，第一天看全书的(1/10)，第二天看了全书的(1/5)，第三天看了全书的(3/10)，三天后剩下几分之几？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(1/10) + (1/5) + (3/10)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>