实际问题: 某同学在A、B两家商场都发现了他看中的一种运动服和运

实际问题:

某同学在AB两家商场都发现了他看中的一种运动服和运动鞋,两家商场的运动服和运动鞋的单价都是相同的,运动服和运动鞋的单价之和是452元,且运动服的单价是运动鞋的单价的4倍少8元。

1)求该同学看中的运动服和运动鞋各是多少元?

2)某一天该同学上街,恰好赶上商场促销,A商场所有商品打八折销售,B商场全场购物满100元返购物券30元(不足100元不返券,购物券全场通用),但他只带了400元钱,如果他只在一家商场购买看中的这两样商品,你能说明他可以选择在哪一家购买吗?若两家都可以选择,在哪一家购买更省钱?

答案

 (1)设运动鞋的单价为x元,则运动服的单价为(4x+8)元,得:

     x+(4x+8)=360

   解得:x=92              ……………2

    ∴运动服的单价为:4x+8=360()    ……………4

   (2) 如果在A商场购买:452×0.8=361.6<400 ……………5

如果在B商场购买:先买运动服花360元,返90购物券,再买球鞋,花90元购物券,另加2元现金。共花费:

360+2=362361.6    ……………7

∴在两家商场都可以购买;但在A商场更省钱。……………8

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