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Am nevoie urgent de un răspuns Varog​

Am Nevoie Urgent De Un Răspuns Varog class=

Răspuns :

Răspuns:

3)15/7+3/14-7/21=90/42+9/42-14/42=85/42

4)13/12-5/20=65/60-15/60=40/60

5)3/50-7/25=3/50-14/50=-11/50