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KH L 6 M N OEF +6 P L 6 =EQ< 2OAIR 2 ;= <S N MATA> 2 ;U " * ABVWJ X 6 MP +6 Y K B + ;Z ) +6 6 6 = *[ 2\ 6 7 8= + R + 7 8 6 7 8∈ ⇒ = − UEQ*]^_ 2ATA ;) *ABE`EIWF*AB<a 2 GWbG c = c!O = OE`2OAIR 2 ;= = 7 8 6⇒ L = &+ 7 + 6 + D K 6 − + − = − "2 F< E 6 = − (+ 6 6 K 6 6 − = + 34 F< E D 6 = + + 6 7 + 6 + G 7 6 + 6 6+ − = + + + 35 F< 6 E 6 = − >+ 6 6 E + D + 7 E + 6 6 − + + = − + 3 F< 6 K 6 = − + M+ 6 + E K 6 6 + + = + 64 F< 6 E 6 = − N+ 6 E 7 + 7 L 6 6 + − = − 4 F< 6 E 6 = + #+ E + 7 + K G 76 6 6 − + − = − 4 F< E 6 6 = − + 6 E + 7 L 6 6 − + = − F< 6 6 = − + 6 7+ 7 + 7+ 7 + 6 6 6 6 − + + + − = − 2F< 7 7 E E 6 = − O+ E + D E 6 6 6 6 + − = − F< 7K 7 6 6 6 = ± − + E 7G 6H 6 = + F< E 6 = + + 6 I6 6+ = F< IR 6 6 = = ± + 66 6 6 6= + F< 7 7I 6 6 6 6 = = − ± + 66 7+ 7 7I E6 6 6+ + − + = + F< 7 66 = − ./ 7 K 6 6 = − − .+ K E 7 I 6 6 + − − = F< 7 E6 = − − ./ 6 E6 = − + 6 7 E + 7 6 6 6 − + = + F< I6 = ./ DK L 6H 6H 6 = − − %+ 7 7 + 7 + 6 6 6 + + = − − F< 6 = − -+ 7+ 6 6 6 6 + − + ⋅ = F< 7 7 6 6 6 6 6 = − − ± 3 C ;B 9&*-.#C-!"# = & www.MATHVN.com - Toán Học Việt Nam www.DeThiThuDaiHoc.com !" !" #$%&''&'%% () *+ $*,)-. / %&001%1 2345%4 &+ 67 6 6ω = + + K + 6 7 6 6 + = − + 2F< 6 E 7Eω = + ⇒ ω = (+ 6 6ω = + 7 E 7 6 − = ⋅ − F< 7 6ω = + ⇒ ω = + 6 6ω = + E 7 E+ 7 6 − = ⋅ − 2F< G G G 6ω = − − ⇒ ω = >+ 6 6 7 6 6 6 − + ω = 7 + + 6 6 6 6 + − + = 7 F< 7 E 7Iω = − + ⇒ ω = M+ D 7 6 6 ω = + + 6 67 7+ 6 6 6+ = − + − F< 7 7 7 6 6 6 ω = − ω = − − + < ω = + 76 H H 7 E+ 6 + 7 E+ 7 + + − − + # 9& !,#- 6 G HD I6 <6 + + = F< 6 K 6Lω = − + ⇒ ω = 3 C ;B * P&Q1# "C& &+ K6 = 4(0#6 5. F< E 6 = ± ± (+ 6 66 − + = 5. P , 4E,T F< 6 6 7 6+ 6 = ± − ∓ + 6 7 K 6 E I6 6 + − − − + = 4(0#6 5. F< E D 6 E 6 6 6 = + ∨ = + >+ 7 6 K6 + − = ED6 6 = F< 6L E E K K K 6 6 = + ∨ = − + M+ 6 + 7I6 − + = 6K6 6 = 5 F< E D K6 6= + ∨ = N+ 7 6 66 6 + − = − − 7 K6 − = F< 6 H 7 E K K 6 6 = + ∨ = − − #+ 6 66 6 6 − = − + 6 6 + D6 6+ = F< E E 7 D D 6 = + ⋅ + 76 = 6 6 E6 6− = 4>!,# 5.UF< E 7 7 E 6 6 6 6 6 6 = − ∨ = − + 76 K G E 6 6 − = − D 7 G 6 6 − = − F< 7 6 = + 3 C ;B * P&Q1# "C& Nhận xét. Số phức là L ảo ⇔ phần thực I= và số phức là thuần thực ⇔ phần ảo I= . &+ 66 = 66 5. F< 7 7 6 6 = ± = − ± (+ 66 − = 7+ +6 6 − + 4 F< 7 7 6 6 6 = = − + + 7 E + 6− 4 6 K 76 − + = F< J 67 6 H K K 6 6 = + = + >+ 7+ 6 +6 6 − + 4 7 K6 − = F< 6 6 6 6 6 = = − M+ 7 K6 6 − + − = ( )6 +6 6− + 5. 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