Question

[Lee Vincent]

Tính

B= \(\frac{1}{25.27}\)+ \(\frac{1}{27.29}\)+ \(\frac{1}{29.31}\)+ ..... + \(\frac{1}{73.75}\)

Answer 1

[My love Third Kamikaze]

B = \(\frac{1}{25}\)- \(\frac{1}{27}\)+ \(\frac{1}{27}\)-\(\frac{1}{29}\)+\(\frac{1}{29}\)-\(\frac{1}{31}\)+... + \(\frac{1}{73}\)-\(\frac{1}{75}\)=

B = \(\frac{1}{25}\)-\(\frac{1}{75}\)

B = \(\frac{2}{75}\)

Ủng hộ  mik nha, mk đg âm điểm nè

Answer 2

[Nguyễn Phương Uyên]

B = 1/2.(1/25-1/27+1/27-1/29+....+1/73-1/75)

    = 1/2.(1/25-1/75)

   =1/2.2/75

   = 1/75

kik cho mk nhé. đúng đấy. kb luôn