Question

某种小册子九本的总价不到 $ $10.00$ ，而十本的总价超过 $ $11.00$ 。一本小册子的价格是多少？

Nine copies of a certain pamphlet cost less than $ $10.00$ while ten copies of the same pamphlet (at the same price) cost more than $ $11.00.$ How much does one copy of this pamphlet cost?

$1.07

$1.08

$1.09

$1.10

$1.11

答案：E

知识点：不等式极限情形界定

难度评级：950

解答：

由 $9p \lt 10$ 得 $p \lt 1.111\ldots$ ，由 $10p \gt 11$ 得 $p \gt 1.10$ 。

在 $\$1.10$ 和 $\$1.111\ldots$ 之间唯一的整美分价格是 $\$1.11$ 。

所以正确答案是 E。

From $9p \lt 10$ we get $p \lt 1.111\ldots,$ and from $10p \gt 11$ we get $p \gt 1.10.$

The only price in whole cents between $\$1.10$ and $\$1.111\ldots$ is $\$1.11.$

Thus, the correct answer is E .

1985 AMC 8 第 18 题

答案：E

难度评级：950

解答：

其他年份的第 18 题