N1 а) 4m-6m-3m+7+m b) 6+4a-5a+a-7a n2 a) -2,1x-0,4(x-5y)+1,5(-8y-x) b) 6+4a-5a+a-7a n3 a) -2,1x-0,4(x-5y)+1,5(-8y-x)

1)
4м-6м-3м+7м+м
(4-6-3+7+1)м
3м

6+4а-5а+а-7а
6 +(4-5+1-7)а
6-7а
2)
-2.1x-0.4 (x-5y)+1.5 (-8y-x)
-2.1x-0.4x+2y-12y-1.5x
-4x-10y