(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
Поделитесь своими знаниями, ответьте на вопрос:
(х+у-z)-(x+у-z), (а+b-c)+2, a+(b-c), a-(a-b+c), (x-y)-(x-y), (a-b+1)-(a+b-1),
(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