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a)
2a+(3a-7)=2a+3a-7=5a-7
b)
x-(2x-3)=x-2x+3=-x+3
c)
3x-(y-2x)=3x-y+2x=5x-y
d)
-(3a+6)-4=-3a-6-4=-3a-10
e)
-(2x-1)-(3x-1)=-2x+1-3x+1=-5x
f)
(4a-7b)-(2a+3b)=4a-7b-2a-3b=2a-10b
g)
(2p-r)+(2r-p)=2p-r+2r-p=+-p+r
h)
(x+y)+(x-z)+(z-y)=x+y+x-z+z-y=2x
a)2a+(3a-7)=2a+3a-7=5a-7
b)x-(2x-3)=x-2x+3=-x+3
c)
3x-(y-2x)=3x-y+2x=5x-y
d)
-(3a+6)-4
-3a-6-4=-3a-10
e)
-(2x-1)-(3x-1) odp ma być: -5x
-2x+1-3x+1=-5x+2
f)
(4a-7b)-(2a+3b) odp ma być: 2a-10b
4a-7b-2a-3b=2a-10b
g)
(2p-r)+(2r-p) odp ma być: p+r
2p-r+2r-p=p+r
h)
(x+y)+(x-z)+(z-y) odp ma być: 2x
x+y+x-z+z-y=2x