!"# Thời gian làm bài: 90 phút $%(2,0 đim). = + − − + − !"#$%&%'()* +, /012*&3 4 − " 3 $% (3,0 đim). 5 6 = − + " = − − 4 5 + 4 5 − 78* 5 = − $% (1,0 đim). 9 . .= − " : . . . = + − 7#;9<: $%& (3 đim). 9:∆ " =(93>?%@':AA ∈ 93>?AB ⊥ :B ∈ :CD,E*:9"BA3F 9:A B:A ∆ = ∆ AD A = G#':"HDB $%' (1 đim). 9 I . . = − + + : J . I. = − − − KFLM=NO'P1QR(S'P *C.3 TTTTTTTTTTTTTTTTTTTT()TTTTTTTTTTTTTTTTTTTT B!L!#UUUUUUUUUUUUUGV'1UUUUUUU333 WM4'PUUUUUUUUWM4'PUUUUUUUUUU *"+,-./ 01 01 !"# BQH1XY 23 4567896 3:; $% <=3:;> = − C 3 I − = − − = − C 3 = − = C $% <=3:;> 5 6 6 + = − + + − − = − + + − − C = − + C 5 6 6 − = − + − − − = − + − + + C 6 =− + C <7Z;6< C Z<Z6 C < C $% <=3:;> 9 : + = L : 9= − ( ) ( ) . . . . . = + − − − C . . . . . . . = + − − + = − C $%& <=3:;> [\7]CE M E H C B A ^_ 9:A ∆ " B:A ∆ O · = BAE · = 0 BHE 90 C :A,( · = ABE · HBE :A,%@' C 9:A B:A ∆ = ∆ ( .CO ! C ^_ 9DA ∆ " BA ∆ O 9A<BA(QR* 'F · = 0 BAE 9 0 L · = 0 MAE 90 M` · = 0 BHE 90 L · = 0 EHC 90 M` G . · = MAE · = 0 EHC 90 · =AEM · HEC Va C 9DA ∆ < BA ∆ CC C G .AD<A C O:9<:B"7 9:A B:A ∆ = ∆ 9D<B"7 9DA ∆ < BA ∆ C G .:D<: C ^_ :DB ∆ O · = 0 BHM 90 # .:DbDB C /"G .:bDB C $%' <=3:;> cY.9d"H:CQe ( ) ( ) 9 : I . . J . I. + = − + + + − − − < I 6. − − − C D C I C 6. − ≤ − ≤ − ≤ 3G . 9 : + ≤ 3 C [f.LM=NO'P1QR(S'P *C.3 C ?@ABHc sinh lm cch khc đng vn cho đim ti đa. . + 4 5 − 7 8* 5 = − $% (1,0 đim). 9 . .= − " : . . . = + − 7 #;9<: $%&. − KFLM=NO'P1QR(S'P *C.3 TTTTTTTTTTTTTTTTTTTT()TTTTTTTTTTTTTTTTTTTT B!L!#UUUUUUUUUUUUUGV'1UUUUUUU333 WM4'PUUUUUUUUWM4'PUUUUUUUUUU *"+, - ./ 01 01 !"# BQH1XY 23 45 67 896 3:; $% <=3:;> . 90 · =AEM · HEC Va C 9DA ∆ < BA ∆ CC C G .AD<A C O:9<:B" ;7 9:A B:A ∆ = ∆ 9D<B" ;7 9DA ∆ < BA ∆ C G .:D<: C ^_ :DB ∆ O · = 0 BHM