Question

Bỏ ngoặc, thu gọn:

a.  (-m - n ) + ( m - n  ) -  ( p -2n )

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

Answer 1

( -m - n ) + ( m - n ) - ( p - 2n )

= -m - n + m - n - p + 2n

= ( -m + m ) + ( -n - n + 2n ) - p

= 0 + 0 - p

= -p

Answer 2

a.  (-m - n ) + ( m - n  ) -  ( p -2n )

= -m-n+m-n-p+2n

= -2n-p+2n

=-p

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

=x-y-z-y-x-z-2z+2y

=-2x-2y-2z-2z+2y

=-2x-2y-4z+2y

=-2x-4z

Answer 3

a) (-m - n ) + ( m - n ) - ( p -2n ) =-m-n+m-n-p+2n =(-m+m)+(-n-n+2n)-p =0+0-p =p b)(x -y - z ) - ( y + x + z ) - ( 2z - 2y ) =x-y-z-y-x-z-2z+2y (x-x)+(-y-y+2y)+(-z-z-2z) =0+0-4z =-4z

Answer 4

a) (-m -n ) + ( m-n ) - (p-2n)

= -m -n + m -n - p + 2n

= (-m +m) + (-n -n +2n) -p

= 0 + 0 -p = -p

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

= x-y-z -y -x-z - 2z +2y

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

= 0 + 0 + (-4z) = -4z

Answer 5

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

= x - y - z - y - x - z - 2z + 2y 

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

= 0 + 0 + -4z

= -4z