Ответ:
А) 2+5+(-7) =2+(-7) +5 ;
Б) 4+(-2) +(-1) =(-1) +(4+(-2)) ;
В) -3+2+(-6) =2+(-6+(-3)) ;
Г) -1+2+(-4) =(2+(-4)) +(-1)
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Ответ:
А) 2+5+(-7) =2+(-7) +5 ;
Б) 4+(-2) +(-1) =(-1) +(4+(-2)) ;
В) -3+2+(-6) =2+(-6+(-3)) ;
Г) -1+2+(-4) =(2+(-4)) +(-1)