... Tuyn cỏc luyn thi i hc v Cao ng mụn Toỏn Cho hm s y = x3 + mx + (1) Kho sỏt s bin thi n v v th ca hm s (1) m = -3 Tỡm m th hm s (1) ct trc honh ... < log x 3 S 03 Cõu I (2 im) Cho hm s: y= x2 x 1 Kho sỏt s bin thi n v v th (H) ca hm s Page of 25 Tuyn cỏc luyn thi i hc v Cao ng mụn Toỏn Chng minh rng, vi mi m , ng thng y = mx 3m ct ... Tuyn cỏc luyn thi i hc v Cao ng mụn Toỏn Cõu VI.a (2 im) Trong mt phng vi h ta Oxy, cho tam giỏc ABC cú nh A nm trờn ng thng (d): x 4y = 0, cnh BC song song vi (d), phng trỡnh ng cao BH: x +...