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1. Efectueaza.
3/7+2/7-4/7=
9/12-6/12+4/12=
8/8-2/8+1/8=
3/9+5/9-6/9=
7/7-(2/7+3/7)=
2/9+(8/9-3/9)=
10/10- (2/10+2/10) - (1/10+3/10)

va rog ajutati ma dau coroana​