例1求lim(x2-5x+3) 解lim(x2-5x+3)=limx2-lim5x+3=1-5+3=-1. 解114x2d 例2求im x+5 3x+5) x→>2 imx2-lim3x+im5=22-3.2+5=3≠0, 2 lim x-limI ∴hi 23-17 x少2x2-3x+5im(x2-3x+5) 3 3 x→2 Economic-mathematics 16-3 Wednesday, February 24, 2021Economic-mathematics 16 - 3 Wednesday, February 24, 2021 例2 . 3 5 1 lim 2 3 2 − + − → x x x x 求 解 lim( 3 5) 2 2 − + → x x x  lim lim 3 lim 5 2 2 2 →2 → → = − + x x x x x 2 3 2 5 2 = −  + = 3  0, 3 5 1 lim 2 3 2 − + −  → x x x x lim( 3 5) lim lim1 2 2 2 3 2 − + − = → → → x x x x x x . 3 7 = 3 2 1 3 − = 例１ 求 lim( 5 3) 2 1 − + → x x x ． lim( 5 3) 2 1 − + → x x x lim lim 5 3 1 5 3 1. 1 2 1 = − + = − + = − → → x x x x 解