Aratati ca numarul 9x(5+10+15+...+200):41 este patrat perfect. Va rog cat mai repede !! Am nevoie urgent!! :* :*

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Crisu, raspunsurile primite sunt gresite
solutie buna:
9•(5+10+15+...+200):41=
=9•5•(1+2+3+...40):41=
=9•5•(40*41:2):41=
=9•5•(40*41:2):41=
=9•5•20*41:41=
=9•5•20=
=900=30² =patrat perfect
M-am gandit ca era gresit., dar tot nu stiu unde.
Acum mi-am dat seama de ce.

Răspunsuri

  • Utilizator Brainly
2014-08-28T22:37:07+03:00
9•(5+10+15+...+200):41=
=9•5•(1+2+3+...40):41=
=9•5•(40*41:2):41=
=9•5•(40*41:2):41=
=9•5•20*41:41=
=9•5•20=
=900=30² =patrat perfect

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