∵(√2006-√2005)/(√2004-√2003)=[(√2006-√2005)(√2006+√2005)(√2004+√2003)]/([√2004-√2003)(√2004+√2003)(√2006+√2005)]=(√2004+√2003)/(√2006+√2005)＜1
∴(√2006-√2005)＜(√2004-√2003)