标题: 一道数学题。。。看不懂题意？ [打印本页] 作者: 熊的传人 时间: 2013-3-7 00:01 标题: 一道数学题。。。看不懂题意？ Candy hearts were marked down from 30% to 50% on Vanlentime's day .The following day ,candy hearts were marked down an additional 25%, what was the lowest cost of a candy heart that originally sold for 28$? 答案是7 。怎么算出来的。。。。作者: chibomen 时间: 2013-3-7 00:13
我也不太明白“What was the lowest cost of a candy?",给出的30％和问题的联系在哪？麻烦告诉帮忙下作者: lifeforest 时间: 2013-3-7 01:28
心形糖果在情人节那天降价销售，幅度从30%到50%不等，第二天，心形糖果又额外降了25%，问如果本来卖28，最低能卖多少钱
(28 x 50%) (1-25%) = 21/2 = 10.5 怎么是7？作者: jayee0523 时间: 2013-3-7 09:25
按照一贯思路我也和楼上的孩子答案一样，然后反推了一下。。得7的话说明“marked down an additional 25%”这个额外的25%是原价28刀的，不是降价完之后的14刀的。。