1 chair 64 yuan, 1 desk 135 yuan. The school bought 52 sets of desks and chairs. How much more does it cost to buy desks than chairs? (1 desk with 1 chair, answer in two ways)
1把椅子64元，1张课桌135元．学校买了52套桌椅，买课桌比买椅子多花多少钱？(1张课桌配1把椅子，用两种方法解答)
<gadget id="calculator">135 * 52</gadget>
<output>7_020</output>

<gadget id="calculator">64 * 52</gadget>
<output>3_328</output>

<gadget id="calculator">7_020 - 3_328</gadget>
<output>3_692</output>

<result>3_692</result>