数学题讨论

georgelhb

1. A square contertop has a square tile inlay in the center, leaving an untiled strip of uniform width around the tile. If the ratio of the tiled area to the untiled area is 25 to 39, which of the following could be the width, in inches, of the strip?

1. 1

2. 3

3. 4

(A) 1 only

(B) 2 only

(C) 1 and 2 only

(D) 1 and 3 only

(E) 1, 2, and 3 only

Key: E

Why?

[此贴子已经被作者于2009-2-25 20:43:19编辑过]

georgelhb

是陈向东后面的练习题，确实是不用算的，满阴险的题