Odpowiedź :
a) (x-y)-(z-v) = x-y-z+v
b) -(x+y)-(-z-v) = -x-y+z+v
c) -(x-y)+(z-v) = -x+y+z-v
d) -(-x+y)-(z-v) = x-y-z+v
e ) -(-x+y)+(-z+v) = x-y-z+v
f) -(-x+y) - (-z+v) = x-y+z-v
odp: a,d,e
b) -(x+y)-(-z-v) = -x-y+z+v
c) -(x-y)+(z-v) = -x+y+z-v
d) -(-x+y)-(z-v) = x-y-z+v
e ) -(-x+y)+(-z+v) = x-y-z+v
f) -(-x+y) - (-z+v) = x-y+z-v
odp: a,d,e