Найдите значение алгебраической суммы:   1)0,6+(-2а)+(-5) при а=-2,8   3) 2,7+(-8)+(-4с) с=2   Образец:9+(-5а)+(-7) а=0,8               9+(-5а)+(-7)=9-5а-7=9-5*0,8-7=-2
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