请教一道数学题

liumin617 · 发表于 2010-12-20 14:32:52

The surface area of a square tabletop was changed so that one of the dimensions was reduced by 1 inch and the other dimension was increased by 2 inches. What was the surface area before these changes were made?
(1) After the changes were made, the surface area was 70 square inches.
(2) There was a 25 percent increase in one of the dimensions.

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.

这里的dimension是什么呀, 我只知道有面积和维度的意思, 麻烦能帮我翻译下这道题, 谢谢啦~~

jxdavidolever · 发表于 2010-12-20 15:18:49

你可以把维度理解为方向，2维就是两个不同的方向，题目意思就是一个正方形一边减少1，一边增加2
答案D??

johnson1120 · 发表于 2010-12-20 15:23:32

应该是两个边长的意思，一边短了1，一边长了2

白羽撒旦boy · 发表于 2010-12-20 15:27:33

这题如果不算，我觉得选E

jxdavidolever · 发表于 2010-12-20 15:36:15

这题如果不算，我觉得选E

-- by 会员白羽撒旦boy (2010/12/20 15:27:33)

能说下原因么？

johnson1120 · 发表于 2010-12-20 15:45:13

你可以把维度理解为方向，2维就是两个不同的方向，题目意思就是一个正方形一边减少1，一边增加2
答案D??

-- by 会员 jxdavidolever (2010/12/20 15:18:49)

~~我咋觉得是C？~~
看错题目了，应该是D

liumin617 · 发表于 2010-12-20 15:56:55

谢谢大家, 忘了把答案写上了, 答案是D, 谢谢谢谢啦~~

tobiasyzy · 发表于 2010-12-20 16:02:10

注意square这个条件，就好了，是D

请教一道数学题

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