Keila 从新加坡旅行到日本。
她想把 850 新加坡元（$）兑换成日元（¥）。新加坡的汇率是 $100 = ¥11600，而日本的汇率是 ¥1 = $0.0086。
她声称如果她在新加坡换钱，她会得到更多。
论证她的说法是否正确。
写出你的计算过程。答 ...

计算器使用不等号 English

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完整解法

9

1. Find the amount of Yen received if she changes the money in Singapore.

In Singapore, $\char36{}100 = ¥11600$ .

For $\char36{}850$ ,
$850 \div 100 \times 11600 = 98600$
So she receives $¥98600$ .

2. Find the amount of Yen received if she changes the money in Japan.

In Japan, $¥1 = \char36{}0.0086$ .

For $\char36{}850$ ,
$850 \div 0.0086 = 98837.209\ldots$
So she receives about $¥98837$ .

3. Compare the two amounts and justify the claim.

Since
$98837.209\ldots > 98600,$
the amount received in Japan is greater.

答案

Changing in Singapore gives $¥98600$ , while changing in Japan gives approximately $¥98837$ . Hence her claim is not true; she will receive more if she changes the money in Japan.

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完整解法

9

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