Question

1)(x+y-z)-1 2)x+(y-x) 3)(x+y)-(x-y) 4)(x+y)-(x-y) 5)(x-y+z)-(x+y-z)

Answer 1

X+y-z-1
x+y-x=y
x+y-x+y=2y
четвертое такое же как и 3 ,видимо, опечатка (
ну а если там (х+у)-(х+у) то = х+у-х-у=0
х-у+z-x-y+z= 2z-2y

Answer 2

Let's simplify each expression:

1. (x + y - z) - 1: Apply the distributive property first and then combine like terms: (x + y - z) - 1 = x + y - z - 1

2. x + (y - x): Use the commutative property to rearrange the terms inside the parentheses: x + (y - x) = x + y - x Now, combine the like terms: x + y - x = y

3. (x + y) - (x - y): Apply the distributive property to remove the parentheses: (x + y) - (x - y) = x + y - x + y Now, combine the like terms: x + y - x + y = 2y

4. (x + y) - (x - y): Same as the previous expression. (x + y) - (x - y) = x + y - x + y Combine the like terms: x + y - x + y = 2y

5. (x - y + z) - (x + y - z): Apply the distributive property to remove the parentheses: (x - y + z) - (x + y - z) = x - y + z - x - y + z Now, combine the like terms: x - y + z - x - y + z = -2y + 2z

So, the simplified expressions are:

1. x + y - z - 1
2. y
3. 2y
4. 2y
5. -2y + 2z