Question

Помогите пожалуйста Раскройте скобки и упростите: 1) (x+y)-(y-z)-(z+2,9)= 2) (a+8)-(a+b)+(b-c)= 3) (7-m)+(m+n)-(n-k)= 4) (x-n)+(m-5)-(m-n)=

Answer 1

1) x+ y -y+z-z-2,9=x-2,9=x=2,9
2) a+8 -a-b+b-c=8-c=c=8
3) 7-m+m+n-n+k=7+k=k=7
4)x-n+m-5-m+n=x-5=x=5

Answer 2

I can help you with some math problems. To expand brackets and simplify expressions, you need to apply the distributive property and combine like terms. Here are the steps and answers for each expression:

1) $(x+y)-(y-z)-(z+2.9) = x + y - y + z - z - 2.9 = x - 2.9$ 2) $(a+8)-(a+b)+(b-c) = a + 8 - a - b + b - c = 8 - c$ 3) $(7-m)+(m+n)-(n-k) = 7 - m + m + n - n + k = 7 + k$ 4) $(x-n)+(m-5)-(m-n) = x - n + m - 5 - m + n = x - 5$