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Đào Trí Bình
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Đào Trí Bình
21 tháng 7 2023 lúc 19:54

help me!

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Đào Trí Bình
21 tháng 7 2023 lúc 20:12

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Vì sao Ngốc
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Nohiya Yumi_yêu là ko cầ...
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lê hà châm
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Nguyễn Vũ Thu Trang
30 tháng 1 2017 lúc 16:54

bn có thể lên trang học 24h mà kb với những người từ lp 6 trở lên rồi hỏi bài họ là đc mà! 

tk nha!

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võ kiều oanh
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đố ai đoán dc tên mình
26 tháng 1 2016 lúc 20:10

dài quá máy mình ko tải nủi

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võ kiều oanh
26 tháng 1 2016 lúc 20:12

làm được mấy vế thì làm ko cần làm hết đâu! giúp nha!

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Trần Võ ánh Hoàng
26 tháng 1 2016 lúc 20:14

xin lỗi mình mới học lớp 5

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Uzumaki Naruto
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Đàm Kim Anh
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Trần Hải Đăng
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Nguyễn Ngọc Ánh
13 tháng 10 2018 lúc 21:41

đề bài hình như thiệu bạn ạ

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Phùng Minh Quân
13 tháng 10 2018 lúc 21:52

Áp dụng tính chất dãy tỉ số bằng nhau ta có : 

\(\frac{a_1}{a_2}=\frac{a_2}{a_3}=\frac{a_3}{a_4}=...=\frac{a_n}{a_{n+1}}=\frac{a_1+a_2+a_3+...+a_n}{a_2+a_3+a_4+...+a_{n+1}}\)

\(\Rightarrow\)\(\frac{a_1}{a_2}=\frac{a_1+a_2+a_3+...+a_n}{a_2+a_3+a_4+...+a_{n+1}}\)

\(\Rightarrow\)\(\left(\frac{a_1}{a_2}\right)^n=\left(\frac{a_1+a_2+a_3+...+a_n}{a_2+a_3+a_4+...+a_{n+1}}\right)^n\) \(\left(1\right)\)

Lại có : 

\(\left(\frac{a_1}{a_2}\right)^n=\frac{a_1}{a_2}.\frac{a_1}{a_2}.\frac{a_1}{a_2}.....\frac{a_1}{a_2}=\frac{a_1}{a_2}.\frac{a_2}{a_3}.\frac{a_3}{a_4}.....\frac{a_n}{a_{n+1}}=\frac{a_1.a_2.a_3.....a_n}{a_2.a_3.a_4.....a_{n+1}}=\frac{a_1}{a_{n+1}}\) \(\left(2\right)\)

Từ (1) và (2) suy ra đpcm : \(\left(\frac{a_1+a_2+a_3+...+a_n}{a_2+a_3+a_4+...+a_{n+1}}\right)^n=\frac{a_1}{a_{n+1}}\)

Chúc bạn học tốt ~ 

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Hoàng Tử Lớp Học
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