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[数学] ETS模考软件 数学一道题 求解释!!!

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楼主
发表于 2012-7-7 01:36:02 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
A rectangular game board is composed of identical squares arranged in a rectangular array of  r  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?
r平方-r
r平方-1
r平方
r平方+1
r平方+r


求指导思路!!!!!
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沙发
发表于 2012-7-7 13:34:24 | 只看该作者
huh? 这个很简单吧。。。。总格子数减去一行一列再加上重复不就行了??

r(r+1)-r-(r+1)+1

A
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