The school playground is 72 meters long and 68 meters wide. After the expansion, the length increases by 12 meters and the width increases by 8 meters. How much does the playground area increase?
学校操场长72米，宽68米．扩建后，长增加12米，宽增加8米，操场的面积增加了多少？
<gadget id="calculator">72 + 12</gadget>
<output>84</output>

<gadget id="calculator">68 + 8</gadget>
<output>76</output>

<gadget id="calculator">84 * 76</gadget>
<output>6_384</output>

<gadget id="calculator">72 * 68</gadget>
<output>4_896</output>

<gadget id="calculator">6_384 - 4_896</gadget>
<output>1_488</output>

<result>1_488</result>