Odpowiedź:
1. 2a+2b+2c-a+b+c=a+3b+3c
[tex]2. {a}^{2} + 4ab + 4 {b}^{2} [/tex]
(2a+2b+2c)-(a-b-c) = 2a+2b+2c-a+b+c = a+3b+3c
(a+2b)^2= a2*2a*2b+(2b)^2= a^2+4ab+4b^2
