Выполните действия используя сочетательное свойство сложения. (77+19)+51 18+(32+7) (623+1200)+800 327+(33+589)
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(77+19)+51=77+(19+51)=77+70=14718+(32+7)=(18+32)+7=50+7=57
(623+1200)+800= 623+(1200+800) = 623+2000 = 2623
327+(33+589) = (327+33)+589= 360+589 = 949
Verified answer
(77+19)+51=(51+19)+77=14718+(32+7)=7+(32+18)=57
(623+1200)+800=(1200+800)+623=2623
327+(33+589)=589+(327+33)=949