... x = v ch A a = 12, b = C a = 4, b = B a = 12, b = 12 D a = 10, b = 12 Hng dn gii Ta cú y ' = x a; y '' = 12 x Hm s t cc i ti x = Khi f '(2) = 12 a = a = 12 Mt khỏc f (2) = 12 + 24 + b = ... ST: 0949014414 THI XUT 0,2 2,0 15 1,0 10 5,0 10 0,6 0,8 15 0,4 Tng 25 0,4 0,8 0,8 Vn dng cao 0,4 3,0 50 3,0 2,0 1,0 10 THI HC Kè I NM HC 2016-2017 THI MễN : TON THPT KHI 12 Thi gian lm bi ... x ) D y = ( 3x 1) Cõu 30: Hm s y = x ax + b t cc tr bng ti x = v ch A a = 12, b = B a = 12, b = 12 D a = 10, b = 12 C a = 4, b = Cõu 31: ng thng y = ax b tip xỳc vi th hm s y = x + x x ...