Question

José、Thuy 和 Kareem 都从数字 $10$ 开始。José 从 $10$ 中减去 $1$ ，把答案加倍，然后加 $2$ 。Thuy 把 $10$ 加倍，从答案中减去 $1$ ，然后加 $2$ 。Kareem 从 $10$ 中减去 $1$ ，给答案加 $2$ ，然后把结果加倍。谁得到的最终答案最大？

José, Thuy, and Kareem each start with the number $10$ . José subtracts $1$ from the number $10$ , doubles his answer, and then adds $2$ . Thuy doubles the number $10$ , subtracts $1$ from her answer, and then adds $2$ . Kareem subtracts $1$ from the number $10$ , adds $2$ to his answer, and then doubles the result. Who gets the largest final answer?

José

Thuy

Kareem

José 和 Thuy

José and Thuy

Thuy 和 Kareem

Thuy and Kareem

答案：C

知识点：运算顺序

难度评级：730

解答：

从 $10$ 开始：José 得到 $9, 18, 20$ ；Thuy 得到 $20, 19, 21$ ；Kareem 得到 $9, 11, 22$ 。

Kareem 最后加倍，所以他加上的 $2$ 也被加倍，得到最大结果。

所以正确答案是 C。

Starting from $10$ : José computes $9, 18, 20$ ; Thuy computes $20, 19, 21$ ; Kareem computes $9, 11, 22$ .

Kareem doubles last, so the $2$ he adds is doubled too, giving the largest result.

Thus, the correct answer is C .

1996 AMC 8 第 2 题

答案：C

难度评级：730

解答：

其他年份的第 2 题