强悍40年前的数学课本

<a href="http://picasaweb.google.com/guohua.chang/dAPrLJ/photo#5109959464623170866"><img src="http://lh4.google.com/guohua.chang/Ruo5DzGCZTI/AAAAAAAABPI/5daS1s2fw1k/s800/70-1-5361-1-13-201-20070913165212.jpg" /></a>

<a href="http://picasaweb.google.com/guohua.chang/dAPrLJ/photo#5109959477508072770"><img src="http://lh3.google.com/guohua.chang/Ruo5EjGCZUI/AAAAAAAABPQ/2Pzb9zoWjvo/s800/70-1-5362-1-13-201-20070913165213.jpg" /></a>

<a href="http://picasaweb.google.com/guohua.chang/dAPrLJ/photo#5109959490392974674"><img src="http://lh6.google.com/guohua.chang/Ruo5FTGCZVI/AAAAAAAABPY/zbksYbdv__Y/s800/70-1-5363-1-13-201-20070913165214.jpg" /></a>

<a href="http://picasaweb.google.com/guohua.chang/dAPrLJ/photo#5109959503277876578"><img src="http://lh5.google.com/guohua.chang/Ruo5GDGCZWI/AAAAAAAABPg/p6nT1C-AG9o/s800/70-1-5364-1-13-201-20070913165216.jpg" /></a>