а) 354 + 867 + 646 = 867 + 354 + 646 = 867 + 1000 = 1867
б) 182 + 371 + 218 + 429 = (182 + 218) + (371 + 429) = 400 + 800 = 1200
а) 354 + 867 + 646 = 867 + 354 + 646 = 867 + 1000 = 1867
б) 182 + 371 + 218 + 429 = (182 + 218) + (371 + 429) = 400 + 800 = 1200