Сложите числа применяя законы сложения: вот пример - 199 + 57 + 1 = ( 199 + 1 ) + 57 = 200 + 57 = 257. а) 308 + 57 + 43 =
б) 415 + 72 + 85 =
пример - 321 + (39 + 18) = ( 321 + 39) + 18 = 360 + 18 = 378
г) ( 88 + 87) + 113 =
д) 36 + ( 164 + 79) =
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