(√6+√3)^2=6+2√6*√3+3=9+2√18
(√7+√2)^2=7+2√7*√2+2=9+2√14
因为√18>√14
所以9+2√18>9+2√14
(√6+√3)^2>(√7+√2)^2
所以√6+√3>√7+√2