(х+у-z)-(x+у-z)= x+y-z-x-y+z= 0
(а+b-c)+2 = a+b-c+2
a+(b-c) = a+b-c
a-(a-b+c) = a-a+b-c = b-c
(x-y)-(x-y) = x-y-x+y = 0
(a-b+1)-(a+b-1) = a-b+1-a-b+1 = -2b+2
Ответ:
1) x+y-z-x-y+z=0
2)a+b-c+2
3) a+b-c
4) a-a-b+c=c-b
5) x-y-x+y=0
6) a-b+1-a-b+1=b+2
Объяснение:
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(х+у-z)-(x+у-z)= x+y-z-x-y+z= 0
(а+b-c)+2 = a+b-c+2
a+(b-c) = a+b-c
a-(a-b+c) = a-a+b-c = b-c
(x-y)-(x-y) = x-y-x+y = 0
(a-b+1)-(a+b-1) = a-b+1-a-b+1 = -2b+2
Ответ:
1) x+y-z-x-y+z=0
2)a+b-c+2
3) a+b-c
4) a-a-b+c=c-b
5) x-y-x+y=0
6) a-b+1-a-b+1=b+2
Объяснение: