xiaoming goes to five shop and sends all of his money.he only kno_英语解答

xiaoming goes to five shop and sends all of his money.he only knows in each shop he spends one yuan more than half the money before he goes to the shop.How much does he take before he goes shopping?______

人气：408 ℃　时间：2020-05-16 10:05:44

解答

用反推法
逛完第五个商店：身上的钱为0
逛完第四个商店：身上的钱为(0+1)X2=2
逛完第三个商店：身上的钱为(2+1)X2=6
逛完第二个商店：身上的钱为(6+1)X2=14
逛完第一个商店：身上的钱为(14+1)X2=30
故,答案是：30yuan