Question

найдите верный ответ​

Answer 1

Ответ:

-(a + b + c) = -a - b - c

-(a - b - c) = -a + b + c

+(a - b + c) = a - b + c

-(-a + b - c) = a - b + c

-(a - b + c) = -a + b - c

-(-a + b + c) = a - b - c