DE KIEM TRA HQC Kil NAM HQC 2019-2020 l ll1ND TlNH KON TUM ~O G LAO D\lC VA DAO T~O Mon: TOAN L6'p: 12 Thfri gian : 90 phut ( kh6ng ledthai gian phat aJ) [ DE CHiNH TH(J'c (DJ c6 50 cdu, 05 trang) l\tlf\ DE:123 D&: C,flu Kh6i tr\1 c6 b::111 kinh c%y brmg a va th~ tich bt'lng 3a n thi c6 dai ducmg sinh bfmg B 2a✓ A 2a Cau Cho ham s6 C 9a D 3a f (x) xl1c dinh tre11 t~p hgp IR va c6 dq.o ham la f' ( x) = (x - 1) ( 2x - 1)2 (3 x) Ham s6 f ( x) d6ng bi~n tren khoang nao sau day ? A (2;3) B (0;3) C (-oo;l) D (3;+oo) Cau Ham s6 y = 3x c6 d