Question

+ (a + b + c), + (-a + b + c), - (a - b - c), - (-a + b + c)
Где a, b и c - целые числа.

Answer 1

+ (a + b + c)= a + b + c;

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

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

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