1.Вычислить, используя правила сложения чисел :
А) -251+(354)+(-251)
Б) 458+(-125)+(-254)
В) -738+(-451)+(-354)
Г) 254+(-897)+(-698)
Д) -124+(+356) +(-122)
Е) 1036+( -454)+ (-471)
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