GWD28-30这题是不是没答案呢

ltwy16323 · 发表于 2008-10-3 14:51:00

Q30:

A rectangular photograph is surrounded by a border that is 1 inch wide on each side. The total area of the photograph and the border is M square inches. If the border had been 2 inches wide on each side, the total area would have been (M + 52) square inches. What is the perimeter of the photograph, in inches?

A. 34

B. 36

C. 38

D. 40

E. 42

Answer:

我算的是（x+1)(y+1)=M

(x+2)(y+2)=M+52

解出来是x+y=49

所以答案应该是98，但是没有这个答案啊，请各位给确认下吧，谢谢

barila · 发表于 2008-10-3 16:13:00

矩形photo两边都有框，所以第一次是（x+2)(y+2)=M，第二次是 (x+4)(y+4)=M+52

楼主太粗心了

ltwy16323 · 发表于 2008-10-4 11:10:00

对哈，哎呀~~真的是谢谢你哈

jonathan1987 · 发表于 2008-11-11 19:01:00

这题太阴险了, 我跟lz范的是同样的错误,以后要警惕才行,要认真看题

谢谢咯

GWD28-30这题是不是没答案呢

GWD28-30这题是不是没答案呢

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