Question

C = 1/1x2 + 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6 

bài này dễ lắm đó mấy bn

Answer 1

1/1x2 + 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6

Đặt A = 1/1x2 + 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6

A = 1/1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + 1/4 - 1/5 + 1/5 - 1/6

A = 1/1 - 1/6

A = 5/6

Vậy A = 5/6

Answer 2

C=2+3/2+4/3+5/4+6/5

C=437/60

Answer 3

\(C=\frac{1}{1x2}+\frac{1}{2x3}+\frac{1}{3x4}+\frac{1}{4x5}+\frac{1}{5x6}\)

\(C=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}\)

\(C=1-\frac{1}{6}\)

\(C=\frac{5}{6}\)

Answer 4

\(C=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}\)

     \(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}\)

       \(=1-\frac{1}{6}=\frac{5}{6}\)

Vậy C= 5/6

P/s: "." là dấu nhan nha 

Answer 5

1/1x2 + 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6

1/1x2 + 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6

A = 1/1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + 1/4 - 1/5 + 1/5 - 1/6

A = 1/1 - 1/6

A = 5/6

Vậy A = 5/6

Answer 6

vậy A=\(\frac{5}{6}\)

ai k mk mk sẽ k lại ^-^

Answer 7

1/1x2 + 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6

1/1x2 + 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6

A = 1/1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + 1/4 - 1/5 + 1/5 - 1/6

A = 1/1 - 1/6

A = 5/6

Vậy A = 5/6

Answer 8

1/1x2 + 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6

C= 1/1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + 1/4 - 1/5 + 1/5 - 1/6

C= 1/1 - 1/6

C= 5/6

Vậy C= 5/6