Question

A expressão ( a + b - c ) + ( a - b + c ) - [ ( a + b + c ) + ( c - a + b) ] é igual a:
2a + 2b - 2c
2a - 2b + 2c
2a - 2b - 2c
2a + 2b + 2c

Answer 1

Resposta:

(a+b-c)+(a-b+c)-[(a+b+c)+(c-a+b)]

///// [1(a+b+c)+1(c-a+b)]

(a+b-c)+(a-b+c)-[1a+1b+1c+1c-1a+1b]

///// -2b-2c

1(a+b-c)+1(a-b+c)-2b-2c

1a+1b-1c+1a-1b+1c-2b-2c

Resposta:2a-2b-2c