Ai chỉ cho em 1 xíu với

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heartbatino

[TẶNG BẠN] TRỌN BỘ Bí kíp học tốt 08 môn
Chắc suất Đại học top - Giữ chỗ ngay!!

ĐĂNG BÀI NGAY để cùng trao đổi với các thành viên siêu nhiệt tình & dễ thương trên diễn đàn.

mình đang học đến bài cuối của tìm GTLN.NN của thầy Lê Bá Trần Phương, lúc làm bài tập thì ngắc ngay đúng 1 chỗ của bài. Ai biết chỉ giáo dùm nha!!
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Mình mắc ở ngay chỗ đầu tiên lên chỉ chụp hình chỗ đó. Vậy ai biết thì làm ơn chỉ thật kĩ cho mình nhé (cái chỗ mà dựa theo BĐT côsi ấy mình không hiểu họ làm ntn)@-)@-)
 
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hocmai.toanhoc

heartbatino said:
mình đang học đến bài cuối của tìm GTLN.NN của thầy Lê Bá Trần Phương, lúc làm bài tập thì ngắc ngay đúng 1 chỗ của bài. Ai biết chỉ giáo dùm nha!!
Untitled.jpg

Mình mắc ở ngay chỗ đầu tiên lên chỉ chụp hình chỗ đó. Vậy ai biết thì làm ơn chỉ thật kĩ cho mình nhé (cái chỗ mà dựa theo BĐT côsi ấy mình không hiểu họ làm ntn)@-)@-)
Bấm để xem đầy đủ nội dung ...

Chào em!
Trước tiên em dùng từ cho cẩn thận nhé! mình không hiểu họ làm ntn.
Ở đây đều là giáo viên, nên em sử dụng cho đúng mực.
Còn bài này em áp dụng Bất đẳng thức cosi cho 3 số:
[TEX]a+b+c\geq 3\sqrt[3]{abc}[/TEX]
[TEX]\frac{1}{a}+\frac{1}{b}+\frac{1}{c}\geq 3\sqrt[3]{\frac{1}{a}\frac{1}{b}\frac{1}{c}}[/TEX]
Nhân 2 vế với nhau em được đáp án như trên
 
H

heartbatino

Trước tiên em cám ơn và xin lỗi về cách dùng từ (do lúc đó trang chủ bị lỗi liên tục lúc em học bài (2 lần đang học thì bị hỏng video) với cả lúc em gọi lên tổng đài nhờ trợ giúp thì gọi 6 cuộc không ai bốc máy) nên em mới viết như vậy.

Và em cám ơn về lời giải :D ( em chả hiểu sao dễ như vậy mà mình không nghĩ ra nữa)
 
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