404. A square countertop has a square tile inlay in the center; leaving an untiled stirp 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? I. 3/2; II. 3; III. 9/2 A) I only; B) II only; C) I and II only; D) I and III only; E) I, II and III 答案是E 我看了OG解释,还是不懂最后为什么是I, II and III? 这道题考查什么? |