The train fare from Xiaoming's home to Shanghai is 271 yuan/person, and the air fare is 845 yuan/person. Xiaoming's family of three travels to Shanghai. How much more does it cost to fly than to take the train?
小明家到上海的火车票价是271元/人，飞机票价是845元/人．小明一家三口去上海旅游，乘飞机比坐火车要多花多少钱？
<gadget id="calculator">845 * 3</gadget>
<output>2_535</output>

<gadget id="calculator">271 * 3</gadget>
<output>813</output>

<gadget id="calculator">2_535 - 813</gadget>
<output>1_722</output>

<result>1_722</result>