Question

bỏ dấu ngoặc rút gọn

 

(x-y-z)-(2x+y+z)+(2z-2y)

(m-n-p)-(- m+n-p)-(n+m)

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

Answer 1

1/\(\left(x-y-z\right)-\left(2x+y+z\right)+\)\(\left(2z-2y\right)=x-y-z-2x-y-z+2z-2y\)

\(\left(x-2x\right)+\left(-y-y-2y\right)+\left(-z-z+2z\right)=-x-4y\)

2/\(\left(m-n-p\right)-\left(-m+n-p\right)-\left(n+m\right)=m-n-p+m-n+p-n-m\)

\(=\left(m+m-m\right)+\left(-n-n-n\right)+\left(-p+p\right)=-m-3n\)

3/\(\left(2a+b+c\right)-\left(b+2a+c\right)-\left(2c+b\right)=2a+b+c-b-2a-c-2c-b\)

\(=\left(2a-2a\right)+\left(b-b-b\right)+\left(c-c-2c\right)=-b-2c\)