拉维的钱包里有如图所示的 6 枚硬币。他只拿出 4 枚硬币,刚好付清了一个面包的钱。 以下哪一个金额不可能是该面包的价格?

它不会直接告诉你答案,而是问你卡在哪一步看看 AI 是怎么陪你一步步弄懂这道题的
完整解法
6
1. List the available coins and their values
The available coins are: . In dollars, these are .
2. Check if option (1) $1.65 is possible with exactly 4 coins
To make , we can use: . This uses exactly 4 coins. So is possible.
3. Check if option (3) $1.35 is possible with exactly 4 coins
To make , we can use: . This uses exactly 4 coins. So is possible.
4. Check if option (4) $1.30 is possible with exactly 4 coins
To make , we can use: . This uses exactly 4 coins. So is possible.
5. Check if option (2) $1.40 is possible with exactly 4 coins
To make , we must use the coin (otherwise the maximum with 4 coins is ). We need more from 3 coins. The remaining coins are . We cannot make exactly with 3 of these coins (e.g., , is not possible as there is only one coin). Thus, is not possible.
$1.40 (option 2)
AI 分析,可能出错
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