A square is 60 meters long and 45 meters wide. After expansion, the length increases by 15 meters and the width increases by 8 meters. How much does the area of the square increase after expansion?
一个广场长是60米，宽45米，扩建后长增加15米，宽增加8米，扩建后广场面积增加了多少？
<gadget id="calculator">60 + 15</gadget>
<output>75</output>

<gadget id="calculator">45 + 8</gadget>
<output>53</output>

<gadget id="calculator">75 * 53</gadget>
<output>3_975</output>

<gadget id="calculator">60 * 45</gadget>
<output>2_700</output>

<gadget id="calculator">3_975 - 2_700</gadget>
<output>1_275</output>

<result>1_275</result>