№1
1. -а+b
2.-2a+3c-4b
3.-2+a+4n
4.-6-4c
5. -12c+6a
6. 20-10c
7. -6+6n-8m
8. -4a+16c-24d-4n
№2
1. x-(x-y)= x-x-y=y
2. a-(b+a) = a-b-a= -b
3. (m-n) +n= m-n+n=m
4. (x+y) -y= x+y-y=x
5. 5-(3+x)= 5-3-x=2-x
6) -x+(x+2.7)= -x+x+2.7=2.7
7) -(-b+3.8)+0.7= b-3.8+0.7=b-3.1
8) 4.74- (2a+3.7)=4.74-2a-3.7=1.04-2a
№3
1. -(1-x)-(5.1+x)= -1+x-5.1-x=-6.1
2) -(a-x-3)-(x-a+2) = -a+x+3-x+a-2= 3
3) (a+3.3-a)-(3.3+x)= 3.3-3.3-x=-x
4) (c+4.9) - (5.4+c)= c+4.9-5.4-c= -0.5
5) (n-5.8)-(4.9+n)= n-5.8-4.9-n= 0.9
6. (6.08+a) - (a+9.3)= 6.08+a-a-9.3= -3.22
7. -(m-3.8)+(4.12+m)= -m+3.8+4.12+m= 7.92
8. -(2.43+x-b) - (2.43+b-x) = -2.43-x+b-2.43-b+x= -4.86