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Verifica daca egalitatile urmatoare sunt adevarate: a)2/10+3/10+4/10+5/10+...+10/10-1/10-2/10-3/10-...-9/10=9/10. Dau coroana​

Răspuns :

Răspuns:

Explicație pas cu pas:

2/10 + 3/10 + 4/10 + 5/10 + 6/10 + 7/10 + 8/10 + 9/10 + 10/10 - 1/10 - 2/10 - 3/10 - 4/10 - 5/10 - 6/10 - 7/10 - 8/10 - 9/10 = (2/10 - 1/10) + (3/10 - 2/10) + (4/10 - 3/10) + (5/10 - 4/10) + (6/10 - 5/10) + (7/10 - 6/10) + (8/10 - 7/10) + (9/10 - 8/10)  + (10/10 - 9/10) = 1/10 + 1/10 + 1/10 + 1/10 + 1/10 + 1/10 + 1/10 + 1/10 + 1/10 = 9/10

Răspuns:

10/10-1/10=9/10 restul se reduc

Explicație pas cu pas: