А) 2а+5с-4с-6а+3с+а = (2а+а-6а)+(5с-4с+3с) = -3а+4с
б) 6а–3с+8с-4а+7 = (6а-4а)+(–3с+8с)+7 = 2а+5с+7
в) 5а-7с+5с-2а+4 = (5а-2а)+(-7с+5с)+4 = 3а-2с+4
г) 5(2х-3у)+2(15у–3х) = 10х-15у+30у–6х = 4х+15у
д) 4(2х-3у)–8(х+2у) = 8х-12у–8х+16у = 4у
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А) 2а+5с-4с-6а+3с+а = (2а+а-6а)+(5с-4с+3с) = -3а+4с
б) 6а–3с+8с-4а+7 = (6а-4а)+(–3с+8с)+7 = 2а+5с+7
в) 5а-7с+5с-2а+4 = (5а-2а)+(-7с+5с)+4 = 3а-2с+4
г) 5(2х-3у)+2(15у–3х) = 10х-15у+30у–6х = 4х+15у
д) 4(2х-3у)–8(х+2у) = 8х-12у–8х+16у = 4у