9+7у+8у-у+5у = 3х+15у-2х-20у =
-9x+7x-5x+2x =
10x-4x+x-6x+5 =
0,3a-0,2a-0,7a+0,2a =
-0,8c-4k+0,9c+0,1+3k =
2n+(3k+4n)-(k-7n) =
2n+(3n+4n)-(k-7n) =
4(5-6x)+4(-3x+8) =
3(2k-4c)-(-6k+c) =

1) х+а +(m–2) =
2) (x+y)–m =
3) m+(a–k–b) =
4) –(m–n+5) =
5) (a–b) – (a+b) =
6) (a–b) – (a–b) =
МНЕ СЕГОДНЯ СДАВАТЬ

9+7у+8у-у+5у =  19y+9

3х+15у-2х-20у =  x-5y

-9x+7x-5x+2x =  -5x

10x-4x+x-6x+5 =  x+5

0,3a-0,2a-0,7a+0,2a =  -0,4а

-0,8c-4k+0,9c+0,1+3k = 0,1с-k+0,1

2n+(3k+4n)-(k-7n) =  2n+3k+4n-k+7n=13n+2k

4(5-6x)+4(-3x+8) =  20-24x-12x+32=-36x+52

3(2k-4c)-(-6k+c) = 6k-12c+6k-c=12k-13c

1) х+а +(m–2) =   х+а+m–2

2) (x+y)–m =  x+y–m

3) m+(a–k–b) =  m+a–k–b

4) –(m–n+5) =  -m+n-5

5) (a–b) – (a+b) = a-b-a-b=-2b

6) (a–b) – (a–b) =a-b-a+b=0

9+7у+8у-у+5у = 19у+9

3х+15у-2х-20у = х-5у

-9x+7x-5x+2x == -5х

10x-4x+x-6x+5 = х+5

0,3a-0,2a-0,7a+0,2a =-0,4а

-0,8c-4k+0,9c+0,1+3k = 0,1с-k+0,1

2n+(3k+4n)-(k-7n) =2n+(3k+4n-k+7n)=2n+2k+11n=13n+2k

4(5-6x)+4(-3x+8) = 20-30x-12x+32=-42x+52

3(2k-4c)-(-6k+c) =6k-12c+6k-c= 12k-13c

1) х+а +(m–2) =x+a+m-2

2) (x+y)–m =x+y-m

3) m+(a–k–b) =m+a-k-b

4) –(m–n+5) = -m+n-5

5) (a–b) – (a+b) = a-b-(a+b)= a-b-a-b = -2b

6) (a–b) – (a–b) =0 так как сумма двух противоположных чисел равна нулю