№1.
а. -3,25-4,15+6=-7,4+6=-1,4б. 33-17,9-28,1=33-46=-13
в. -21,4+80-58,6=-80+80=0
г. -19-6,32+4,64=-25,32+4,64=-20,68
№2.
а) 3/4+1/6 = 9/12+2/12 = 11/12б) -8/15-2/3 = -8/15-10/15 = -18/15 = -1 целая и 3/15 = -1 целая и 1/5 = -1,2
в) 7/12-5/8 = 14/24-15/24 = -1/24
г) -1/3+5/6 = -2/6+5/6 = 3/6 = 1/2 = 0,5
№3.
№4. n= -0,76 - -0,65