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a fost răspuns

grupeaza convenabil termenii pentru a calcula mai repede a) 437285 +4001+3999+2715 b) 44666+11778+66444+77212 c) 285330+14670+56789+53211.

Răspuns :

437285 +4001+3999+2715 =(437285+2715)+(4001+3999)=440000+8000=448000

44666+11778+66444+77212 =44666+66444)+(11778+77212)=111110+88990=200100

285330+14670+56789+53211=(285330+14670)+(56789+53211)=300000+110000=410000