考前一天问一道数学题，看了半天没看懂。。。

rockalmighty · 发表于 2012-3-30 09:57:04

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？

dingda6 · 发表于 2012-3-30 12:32:22

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

c5085185 · 发表于 2012-3-30 13:56:21

A r*(r+1)-(r+r+1-1)

古流月 · 发表于 2012-3-30 14:19:33

thanks liao kai

考前一天问一道数学题，看了半天没看懂。。。

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