Ответы на вопрос:
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
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