AMC8 1990

AMC8 1990 · Q6

AMC8 1990 · Q6. It mainly tests Rounding & estimation, Patterns & sequences (misc).

Which of these five numbers is the largest?

这五个数中哪个最大？

(A) $13579 + \frac{1}{2468}$ $13579 + \frac{1}{2468}$

(B) $13579 - \frac{1}{2468}$ $13579 - \frac{1}{2468}$

(D) $13579 \div \frac{1}{2468}$ $13579 \div \frac{1}{2468}$

(E) $13579.2468$ $13579.2468$

Answer

Correct choice: (D)

正确答案：（D）

Solution

All of the choices, except (C) and (D), are near 13579. In (D), the result is the product $(13579)(2468)$ while in (C) the result is much less than 13579.

除了 (C) 和 (D) 外的所有选项都接近 13579。在 (D) 中，结果是 $(13579)(2468)$ 的乘积，而在 (C) 中，结果远小于 13579。

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