... - = k - (*) (1, 0) S nghim ca phng trỡnh (*) bng s giao im ca (C) v d: y = k (*) cú nghim phõn bit - < k - < < k < Cõu II (2,0) II .1 (1, 0) P = 10 00 16 + 0,25 0,25 0,5 0,5 11 1 16 x Ta cú y ... OA2 = 4a 2a a 14 ; S ABCD = a = a 14 a 14 (vtt) V = a2 = III.2 Th tớch nún: a 14 AB a ; h = SO = ; r= = (1, 0) Vnon = r h 2 a 14 Vnon = 24 y " = x , y " = x = 1, y = Cõu IVa (1, 0 ) H s gúc ... x = 3 = 27 = Va.2 (1, 0) log ( x ) 6log x (1) x > iu kin 3x > x > (1) log ( x ) log ( x ) log ( x ) ( x ) x 11 x + Cõu IVb (1, 0 ) k = y ' ( ) = 12 x 24 x + = Phng trỡnh...