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a) 2a+(3a--)=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
4.
a)x-2-2+x=2x-4
b)a+b+2a-b-a+2b=2a+2b
c)3x-y+1-x-y+y-x=x-y+1
d)-2a kwadrat+3ab-2b+3a kwadrat-ab-b=a kwadrat+2ab-3b
Myślę, że pomogłam :)