The school library bought 25 copies of "One Hundred Thousand Whys" at 24 yuan each; and 36 copies of "Learning to Draw" at 18 yuan each. How much did it cost to buy these books?
学校图书馆买了25本《十万个为什么》，每本24元；买了36本＜学画画＞每本18元．买这些书一共花多少元？
<gadget id="calculator">24 * 25</gadget>
<output>600</output>

<gadget id="calculator">18 * 36</gadget>
<output>648</output>

<gadget id="calculator">600 + 648</gadget>
<output>1_248</output>

<result>1_248</result>