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Ma puteti ajuta? e urgentt!!

Ma Puteti Ajuta E Urgentt class=

Răspuns :

OA+OB+OC= 21+29+(-31)-9-31-29=-50
2AB+3CA+5BC=2,22+3+3-2+5+3-1+3-2=14,22
3OA+5BC-3OB= 3•21+29+5•3-1+3-2-3•(-31)-9=191