а)-84=48= - (84-48)= - 36
б)-52-(-25)= - (52-25)= - 7
в)-48* (-105)= -105 *48 = 5040
4)1339 : (-13) = - 1339 : 13 = 103

А)-84+48= - (84-48)= - 36б)-52-(-25)= - (52-25)= - 27в)-48* (-105)= -105 *(-48) = 50404)1339 : (-13) = - 1339 : 13 = -103