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a) (39 +27)×5 , (46 +84 )×3 ,b) (143+257)×6 , (974-361)×4, c) (2483+3156)×4, (5615 -2184)×3 .

Răspuns :

a] 330 ,390 b]2400 , 2452 c]22556 , 10293