Question

-8,9+(z-1,9) -(2,4-a)-10,4

Answer 1

-8,9+(z-1,9) -(2,4-a)-10,4=-8,4+z-1,9-2,4+a-10,4=-23,1+z+a

Answer 2

When simplifying expressions like this, it's usually helpful to group together like terms, which are terms that have the same variable(s) raised to the same power(s).

Starting with the expression:

-8,9 + (z - 1,9) - (2,4 - a) - 10,4

First, let's simplify the parentheses by distributing the negative sign in front of the second set of parentheses:

-8,9 + (z - 1,9) - 2,4 + a - 10,4

Now, let's group together the like terms:

(z - 1,9) + a - 8,9 - 2,4 - 10,4

Simplifying the constants:

(z - 1,9) + a - 21,7

So the simplified expression is:

z + a - 1,9 - 21,7

Or, more simply:

z + a - 23,6