Question

1.Bỏ ngoặc rồi tính :

a) (x-1)-(x-3)

b) (2+y)-(y+1)

c) -x-(y-x-z)

d) x- z-(x-y+z)

Answer 1

1. Bỏ ngoặc rồi tính:

a, ( x - 1)-(x - 3)

= x - 1 - x + 3

= -1 + 3 = 2

b, (2 + y) - ( y + 1)

= 2 + y - y - 1

= 2 - 1 = 1

c,- x -( y - x - z)

= -x - y + x + z

= -y + z

d, x- z - ( x - y + z)

= x - z - x + y - z

= -2z + y

Ticks mình nhé!

Answer 2

a, \(\left(x-1\right)-\left(x-3\right)=x-1-x+3=2\)

b, \(\left(2+y\right)-\left(y+1\right)=2+y-y-1=1\)

c, \(-x-\left(y-x-z\right)=-x-y+x+z=-y+z\)

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