В2,1
№1
a) 3(4-x)=12-3x
б) 8(-6-m)=48-8m
в) -3(-7-t)=21+3t
№2
a)-8(t-2)+4=-8t+16+4=-8t+20
б)-15-2(-4-x)=-15+8+2x=-7+2x
в)-2(x+4)+10(t-2)=-2x-8+10t-20=-2x-28+10t
г) 4(6-a)-7(b+9)=24-4a-7b+63=87-4a-7b
B2.2
№1
1)-(8-x)=-8+x
2)-t-(10-x+y)=-t-10+x+y
3)-15x-(-10+2y+7t)=-15x+10-2y-7t
№2
1)-10.2-(-y-10.2)=-10.2+y+10.2=y
2)-(x-y)+(-t+y)=-x+y-t+y=-x+2y-t
№3
(-p-a)+(-t+p)=-p-a-t+p=-a-t
№4
(x+y)-(m+y-b)=x+y-m-y+b=x-m+b