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( -1 ; 3) - im cc i ca th hm s : ( -1 ; 0); - im cc tiu ca th hm s : ( 3 ; -4 ); 3 th: -Giao im ca th vi 25 trc Oy : (0 ; - 5 ) 8 -Giao im ca th vi trc Ox : (-1 ; 0) & (5 ; 0) y f(x)=(1/8)(x^ 3-3 x^ 2-9 x-5) 5 x -8 -6 -4 -2 2 4 6 8 -5 Hot ng 3 : Hỡnh thnh khỏi nim im un Thi gian 7phỳt Hot ng ca giỏo viờn Hot ngca hc sinh Ghi bng im un ca th : Giỏo viờn dn dt a ra khỏi nim im un Hc sinh tip thu - xỏc... khỏc-1 -. iu ny tng ng vi : { >0 { m2-m-2>0 f (-1 ) # 0 -m-+3#0 m bbt 7 + Theo dừi giỏ tr ca y KL min, max Ghi bng Vd1: D= R y = -2 x + 2; y =0 x=1 x - y y 1 + - 0 4 - +Ơ - max y = 4 khi x=1 xẻ R Vd2: Cho y = x3 +3x2 + 1 a/ Tỡm min, max ca y trờn [- Tớnh y + Xột du y 1; 2) b/ Tỡm min, max ca y trờn + Bbt => KL [- 1; 2] h/s khụng cú giỏ tr min trờn R Vd2: y = 3x2 + 6x x ộ =0 y =0 ờ = - 2 x ờ x- y 8 Ơ + y ở -2 0 -1 0 2... 1 2/Bng ph: - Hỡnh 1.6 trang 28 SGK - Hỡnh 1.7 trang 29 SGK - Hỡnh 1.9 trang 30 SGK - Hỡnh 1.11 trang 33 SGK Ngy son :12/ 09 /2009 : 2 tit Đ6 KHO ST S BIN THIấN V V TH MT S HM A THC I/ Mc tiờu: +V kin thc : - Giỳp hc sinh bit cỏc bc kho sỏt cỏc hm a thc v cỏch v th ca cỏc hm s ú +V k nng : -Giỳp hc sinh thnh tho cỏc k nng : - Thc hin cỏc bc kho sỏt hm s - V nhanh v ỳng th + T duy thỏi - Nhanh chúng,chớnh . 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