Question

Giúp mik 2 bài này với

A = \(\frac{1}{5}-\frac{3}{7}+\frac{5}{9}-\frac{2}{11}+\frac{7}{13}-\frac{9}{16}-\frac{7}{13}+\frac{2}{11}-\frac{5}{9}+\frac{3}{7}-\frac{1}{5}\)

B = \(\frac{1}{100}-\frac{1}{100.99}-\frac{1}{99.98}-\frac{1}{98.97}-...-\frac{1}{3.2}-\frac{1}{2.1}\)

Cố gắng giúp mik giải 1 cách chi tiết nhé

Answer 1

câu b nha

B= 1/100 - (1/2.1 + 1/3.2 + ... + 1/98.97 + 1/99.98 + 1/100.99)

B=1/100 - (1 - 1/2 + 1/2 - 1/3 + 1/3 - ... - 1/99 + 1/99 - 1/100)

B=1/100-(1-1/100)

B=1/100-99/100

B= - 98/100

B= - 49/50

đ ú g nha

 

Answer 2

- Câu a ~> http://olm.vn/hoi-dap/question/183158.html

Answer 3

A=\(\frac{-9}{16}\)

B= -1

Answer 4

A=\(\frac{-9}{16}\)

B=\(\frac{-48}{50}\)

Answer 5

A=\(\frac{-9}{16}\)

B=\(\frac{-48}{50}\)

Answer 6

A= 1/5 - 3/7 + 5/9 - 2/11 + 7/13 - 9/16 - 7/13 + 2/11 - 5/9 +3/7 - 1/5

= 1/5 - 1/5 - 3/7 + 3/7 + 5/9 - 5/9 - 2/11 +2/11 + 7/13 - 7/13 - 9/16

= 0 - 0 +0 - 0 + 0 - 9/16

= - 9/16