x2-1 例5求皿3-x-1+x 解 √3-x-√1+x lim (x2-1)(√3-x+√1+x) 2(1-x) (+』)(3一X+^I+不) 2、2 Economic-mathematics 16-7 Wednesday, February 24, 2021Economic-mathematics 16 - 7 Wednesday, February 24, 2021 . 3 1 1 lim 2 1 x x x x − − + − → 求 2(1 ) ( 1)( 3 1 ) 2 1 x x x x x − − − + + = → lim lim x x x x − − + − → 3 1 1 2 1 2 ( 1)( 3 1 ) lim 1 x x x x − + − + + = → 解 例5 = -2 2