Toán khó lớp 6

Question

Chứng minh rằng: 1/2^2 + 1/3^2 + 1/4^2 + 1/5^2 +1/6^2 + 1/7^2 + 1/8^2 < 1

Comments

minh biet

 

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nho tick minh nha ban

 

Answer 1

1/2^2 + 1/3^2 + 1/4^2 + 1/5^2 +1/6^2 + 1/7^2 + 1/8^2 < 1/1.2 + 1/2.3 +..... + 1/7.8 

 = 1 - 1/2 + 1/2  - 1/3 +... 1/7 - 1/8 

= 1 - 1/8   < 1

 

 

Comments

hoi thieu ban oi

 

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ban chung to nhu the bi tru nua diem day

 

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Bạn trình bày vậy là đúng rồi đó

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ma ban noi ai vay

 

 

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nói whiteflower

Answer 2

goi phep tren la a

 

a = 1/2mu2 +1/3mu2 +........+ 1/8mu2

a= 1/2x2 +1/3x3 +.....+ 1/8x8

ta co :

a=1/2mu2 =1/2x2