There are 72 books on Xiaoming's bookshelf, including 12 science books, and the novels are science books (1/2). There are 10 books with blue covers, 4 science books with blue covers, and 3 fiction books with blue covers. How many books are there on the bookshelf that do not have blue covers and are neither science books nor novels? ? (column solution)
小明家的书架上共有72本书，其中科技书有12本，小说书是科技书的(1/2)．蓝色封面的书有10本，蓝色封面的科技书有4本，蓝色封面的小说书有3本，问书架上不是蓝色封面的并且既不是科技书又不是小说的书有多少本？(列式解答)
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">72 - 12 - 6 - 10</gadget>
<output>44</output>

<gadget id="calculator">44 + 4 + 3</gadget>
<output>51</output>

<result>51</result>