A rectangular playground is 80 meters long and 60 meters wide. Now it is necessary to expand the field, increasing the length by 25 meters and the width by 15 meters. How many square meters has the area increased after the expansion? (Try to calculate both ways)
一个长方形操场，长80米，宽60米，现在要扩建这个场地，长增加25米，宽增加15米．扩建后的面积增加了多少平方米？(试着用两种方法计算)
<gadget id="calculator">80 + 25</gadget>
<output>105</output>

<gadget id="calculator">60 + 15</gadget>
<output>75</output>

<gadget id="calculator">105 * 75</gadget>
<output>7_875</output>

<gadget id="calculator">60 * 80</gadget>
<output>4_800</output>

<gadget id="calculator">7_875 - 4_800</gadget>
<output>3_075</output>

<result>3_075</result>