因为(√7-√3)(√7+√3)=7-3=4
(√6-√2)(√6+√2)=6-2=4
所以(√7-√3)(√7+√3)=(√6-√2)(√6+√2)
而√7+√3﹥√6+√2
所以√7-√3＜√6-√2