new microsoft word document (2)

P = + ( ab + bc + ca ) 2 − 2 abc ( a + b + c ) + 12 abc + 72 ab + bc + ca − 1 2 abc P= ab +bc +ca + 72 ab + bc +ca − 1 2 abc ( do a+b+c =6) Giả sử a min -> 1 ≤ a ≤ 2 P = a(b+c)+bc + 72 a ( b +c ) +bc − 1 2 abc F(a)=P= a(6-a)+bc + 72 a ( 6 − a ) +bc − 1 2 abc Đạo hàm các em à : F’(a) = 6 !a -"#$ bc + 2 a − 6 ( 6 a − a 2 − bc ) 2 %ái nà& 'h ch c ch n ma* hi a min , # a ./0i . m o ạo hàm n2a 3 5 a min = 1 'ha& ào F(a) 'a c hàm c7a bc :/ F(bc) = bc +$ + 72 bc +5 − 0.5 bc = "5$ bc + 72 bc + 5 +$ 8ài 'oán /a 9 dạn ';m ma* c7a F (bc) s 1=<b#c =< 4# b+c =$ a coi F(bc ) .à hàm s ?n bc 'h ạo hàm s@ 'hA& # 'a cB 'hC iả sử b=<c ha& c= $-b iDE ' c iải # sử d n ạo hàm .à ,a : ---- &Hn IJn Ph/Kn --------

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P = + P= ab +bc +ca + ( do a+b+c =6) Gi s a min -> 1 P = a(b+c)+bc +F(a)=P= a(6-a)+bc +o hm cc em :F(a) = 6 2a -0,5 bc +Ci ny thj chc chn max khi a min ruj , a li lm ko o hm na u :3 :3 . a min = 1 thay vo F(a) ta c hm ca bc : F(bc) = bc +5 + = 0.5 bc + +5Bi ton a v dng tm max ca F (bc) vs 1=

Nuevo Microsoft Word Document

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