1)а+(b-c)=a+b-c
2)x-(y+2)=x-y-2 1)1,9(а+2)=1.9a+3.8
3)m-(-n-k)=m+n+k 2)3(а-1,7)=3a-5.1
4)9-(a+b+c)=9-a-b-c 3)-2(х-0,9)=-2x+1.8
5)x-(-3+y-z)=x+3-y+z 4)-3(1,6+y)=-4.8-3y
6)m+8+n+k)=m+8+n+k 5)1,3(a+b)=1.3a+1.3b
7)a-(b-c+d)=a-b+c-d 6)-4(x+y)=-4x-4y
8)x+(y-z+8)=x+y-z+8
9)m-(-2+n+k)=m+2-n-k