478.
-12-13= -(12+13)= -25
-39-60= -(39+60)= -99
-27-43= -(27+43)= -70
-85-91= -(85+91)= -176
-64-56= -(64+56)= -120
-57-41= -(57+41)= -98
479.
17-50= -50+17= -33
36-60= -60+36= -24
41-73= -73+41= -32
58-31 = 27
130-203=-203+130= -73
113-150= -150+113= -37
480.
-7,3-8,1= -(7,3+8,1)= -15,4
-6,5+3,2= -3,3
15,7-23,5= -23,5+15,7= -7,8
-6,91+12,4=5,49
478.
-12-13= -(12+13)= -25
-39-60= -(39+60)= -99
-27-43= -(27+43)= -70
-85-91= -(85+91)= -176
-64-56= -(64+56)= -120
-57-41= -(57+41)= -98
479.
17-50= -50+17= -33
36-60= -60+36= -24
41-73= -73+41= -32
58-31 = 27
130-203=-203+130= -73
113-150= -150+113= -37
480.
-7,3-8,1= -(7,3+8,1)= -15,4
-6,5+3,2= -3,3
15,7-23,5= -23,5+15,7= -7,8
-6,91+12,4=5,49