The price of a notebook is 6.75 yuan, which is 4.5 yuan more than an eraser. How much does it cost to buy a notebook and an eraser?
一本笔记本的价钱是6.75元，比一块橡皮擦贵4.5元，买一本笔记本和一块橡皮擦共要多少元？
<gadget id="calculator">6.75 - 4.5</gadget>
<output>2.25</output>

<gadget id="calculator">2.25 + 6.75</gadget>
<output>9</output>

<result>9</result>