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标题: 考前一天问一道数学题，看了半天没看懂。。。 [打印本页]

作者: rockalmighty 时间: 2012-3-30 09:57
标题: 考前一天问一道数学题，看了半天没看懂。。。

A rectangular game board is composed of identical squares arranged in a rectangular array of e rows and r+1 columns. The r rows are numbered from 1 through r, and the r+1 columns are numbered from 1 through r+1. If r>10, which of the following represents the number of squares on the board that are neither in the 4th row nor in the 7th column?
A. r^2-r
B. r^2-1
C. r^2
D. r^2+1
E. r^2+r
这个题是什么意思，怎么做呀？

作者: dingda6 时间: 2012-3-30 12:32
一个由方块组成的r行，r+1（r>10）列的矩形，去掉第4行和第7列，还剩多少个方块？
这样讲应该很简单了吧

作者: c5085185 时间: 2012-3-30 13:56
A r*(r+1)-(r+r+1-1)

作者: 古流月 时间: 2012-3-30 14:19
thanks liao kai

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