Question

M=1/1.2+1/2.3+...+1/49.50

Answer 1

M=1/1.2+1/2.3+...+1/49.50

M=1-1/2+1/2-1/3+...+1/49-1/50

M=1-1/50

M=49/50

Answer 2

m=1-1/2+1/2-1/3+....+1/40-1/50

   = 1/-1/50

   = 49/50

Answer 3

Đặt A=1/1.2+ 1/2.3+1/3.4+1/4.5+...+1/49.50 

=2-1/1.2 + 3-2/2.3+4-3/3.4+5-4/4.5+.......+50-49/49... 

=2/1.2 - 1/1.2+ 3/2.3 - 2/2.3+4/3.4 - 3/3.4 + ................+50/49.50 - 49/49.50 

=1- 1/50 

=49/50 

Vậy giá trị của biểu thức A là 49/50

Answer 4

M=1/1.2+1/2.3+...+1/49.50

=1-1/2+1/2-1/3+...+1/49-1/50

=1-1/50

=49/50

Answer 5

M=1/1.2+ 1/2.3+1/3.4+1/4.5+...+1/49.50 

=2-1/1.2 + 3-2/2.3+4-3/3.4+5-4/4.5+.......+50-49/49... 

=2/1.2 - 1/1.2+ 3/2.3 - 2/2.3+4/3.4 - 3/3.4 + ................+50/49.50 - 49/49.50 

=1- 1/50 

=49/50 

Vậy giá trị của biểu thức A là 49/50

Answer 6

M=1/1.2+ 1/2.3+1/3.4+1/4.5+...+1/49.50 

=2-1/1.2 + 3-2/2.3+4-3/3.4+5-4/4.5+.......+50-49/49... 

=2/1.2 - 1/1.2+ 3/2.3 - 2/2.3+4/3.4 - 3/3.4 + ................+50/49.50 - 49/49.50 

=1- 1/50 

=49/50 

Vậy giá trị của biểu thức A là 49/50

Answer 7

\(M=\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+...+\frac{1}{49\cdot50}\)

\(M=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{49}-\frac{1}{50}\)

\(M=1-\frac{1}{50}\)

\(M=\frac{49}{50}\)

Answer 8

M=1/1-1/2+1/2-1/3+.....+1/49-1/50

M=1-1/50

M=49/50

quá dễ!

Answer 9

1/1.2+1/2.3+...+1/49.50

=1/1-1/2+1/2-1/3+...+1/49-1/50

=1/1-1/50

=49/50

chính xác lun nha bạn, k cho mik

Answer 10

M=1/1-1/2+1/2-1/3+....+1/49-1/50 =1/1-1/50 =50/50-1/50 =49/50

Answer 11

A = 1 1.2 + 1 2.3 + 1 3.4 + ... . + 1 49.50 A = 1 − 1 2 + 1 2 − 1 3 + 1 3 − 1 4 + ... . + 1 49 − 1 50 A = 1 − 1 50 = 49 50