Question

Giúp em với:
\(\left(x+y+z\right)^2\)\(+2\left(x+y+z\right)\)\(\left(a-b\right)+\left(a-b\right)^2\)
 

Answer 1

\(\left(a-b\right)^2+2\left(x+y+z\right)\left(a-b\right)+\left(x+y+z\right)^2\)

\(=\left(a-b+x+y+z\right)^2\)

Answer 2

\(\left(x+y+z\right)^2+2\left(x+y+z\right)\left(a-b\right)+\left(a-b\right)^2\)

\(=\left(x+y+z+a-b\right)^2\)