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1. Calculati:
(7/21+1/14) - (1/35-1/42) - (1/14-1/21);


Răspuns :

Răspuns:

Explicație pas cu pas:

7/21 + 1/14 - 1/35 + 1/42 - 1/14 + 1/21 = 8/21 - 1/35 + 1/42 = 16/42 + 1/42 - 1/35 =

= 17/42 - 1/35 = 85/210 - 6/210 = 79/210