Aunt Li bought a piece of fabric to make clothes. This piece of fabric is used to make a top (4/11), and this piece of fabric is used to make a skirt (2/11), what fraction of this piece of fabric is left useless?
李阿姨买了一块布料做衣服．做上衣用去这块布料的(4/11)，做裙子用去这块布料的(2/11)，还剩下这块布料的几分之几没用？
<gadget id="calculator">4 / 11</gadget>
<output>4/11 = around 0.363636</output>

<gadget id="calculator">2 / 11</gadget>
<output>2/11 = around 0.181818</output>

<gadget id="calculator">1 - (4/11) - (2/11)</gadget>
<output>5/11 = around 0.454545</output>

<result>5/11 = around 0.454545</result>