GWD 17-5

Q5:

Can a certain rectangular sheet of glass be positioned on a rectangular tabletop so that it covers the entire tabletop and its edges are parallel to the edges of the tabletop?

(1)     The tabletop is 36 inches wide by 60 inches long.

(2)     The area of one side of the sheet of glass is 2,400 square inches.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

Answer: e

为什么呀？

the sheet of glass 可以长为８０，宽为３０，那当然不能完全覆盖了

ＪＪ连续问了这么多个比较基本的问题，是不是还没有熟悉数学的套路啊？不过，多做几套ＧＷＤ，就ＯＫ了．

我刚刚做GWD数学，请教楼上GWD数学有什么套路呀？一般它都喜欢设什么陷阱呀？

楼上的说不能完全覆盖不就是回答了题目了么？

不明白

E

条件一,桌子表面是36*60,无法知道sheet of glass的大小,单独不充分;

条件二,sheet of glass的面积是2400,这里有可能是24*100,有可能是48*50,但不知道桌面相关条件,单独不充分;

条件一二相结合,sheet of glass的面积是2400,如果是24*100,不可覆盖桌面;如果是48*50,可覆盖桌面,答案不唯一

所以选E

条件一,桌子表面是36*60,无法知道sheet of glass的大小,单独不充分;

还是有点迷惑，sheet of glass 面积不就是36*60吗？题意是说要把桌子罩起来吗，还是仅仅覆盖桌子表面？

请不吝赐教！！

我也很不明白题目中说的 the area of one side of the sheet的意思, 一边的面积?还是说着个长方体, 它的侧面积是2400?

谢谢解答~!!