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punctul d) am nevoie urgent !!!

Punctul D Am Nevoie Urgent class=

Răspuns :

400/81 - 399/81 + 398/81 - .... + 2/81 - 1/81 = 

(se grupeaza cate doua)

(400/81 - 399/81) + (398/81 - 987/81) + .... + (2/81 - 1/81) = 

400/2=200  (vor fi 200 perechi)

1/81 + 1/81 + ... + 1/81 = 200/81 ----- acesta este raspunsul!

=1/81+1/81+........+1/81   200 de termeni(400/2=200)    =200/81