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(-4/7)+6/35+(-31/25)+8/20+1/25

Răspuns :

[tex]-4/7=-20/35 \\ 8/20=14/35 \\-31/25+1/25=-30/25=-6/5=-42/35 \\ -20/35+6/35-42/35+14/35= \\ =(-20+6-42+14)35= \\ =-42/35 = \\ =-6/5[/tex]