Примени переместительное свойство сложения
28+45 = __ + __
439+627 = ___ + ___
3 + (16+2) = (16+2) + _
(60+4) + 30 = __ + (__ +_)
28+45 = __ + __
439+627 = ___ + ___
3 + (16+2) = (16+2) + _
(60+4) + 30 = __ + (__ +_)
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Verified answer
28+45 = 45+ 28 =73439+627 = 627+ 439=1066
3 + (16+2) = (16+2) + 3 = 18 + 3 = 21
(60+4) + 30 = 30+ (60 +4)= 30 + 64 = 94