√2004-√2003=(√2004-√2003)(√2004+√2003)/(√2004+√2003)
=1/(√2004+√2003)
√2003-√2002=(√2003-√2002)(√2003+√2002)/(√2003+√2002)
=1/(√2003+√2002)
√2004+√2003＞√2003+√2002
所以1/(√2004+√2003)＜1/(√2003+√2002)
所以√2004-√2003＜√2003-√2002
说明 平方是错误的..根本无法比较