Xiaoxiao’s family spent a total of 8,640 yuan on a TV and a refrigerator, and the price of the TV was exactly three times that of the refrigerator. How much did the Xiaoxiao family spend on the TV? (First write out the equivalent relationship, and then use the method of column equation to solve it)
笑笑家买一台电视机和一台电冰箱共花了8640元，电视机的价格刚好是电冰箱的3倍．笑笑家买电视机花了多少钱？(先写出等量关系式，再用列方程的方法解答)
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">8_640 / 4</gadget>
<output>2_160</output>

<gadget id="calculator">2_160 * 3</gadget>
<output>6_480</output>

<result>6_480</result>