a) (x-y+1)-(2x+y+1)+(x-y+1)=
=x-y+1-2x-y-1+x-y+1=
=-3y+1
===========================
b) -(x-y+1)+(x+y-1)-(y+2x-1)=
=-x+y-1+x+y-1-y-2x+1=
=-2x+y-1
c) (y-x-1)-(x-y+1)+(2x+y-1)=
=y-x-1-x+y-1+2x+y-1=
=3y-3=
=3(y-1)
d) (x-2y+1)+(1-2x+y)-(1+x-y)=
=x-2y+1+1-2x+y-1-x+y=
=-2x+1
a)
(x-y+1)-(2x+y+1)+(x-y+1)=
x-y+1-2x-y-1+x-y+1= -3y+1
b)
-(x-y+1)+(x+y-1)-(y+2x-1)=
-x+y-1+x+y-1-y-2x+1= -2x+y-1
c)
(y-x-1)-(x-y+1)+(2x+y-1)=
y-x-1-x+y-1+2x+y-1= 3y-3
d)
(x-2y+1)+(1-2x+y)-(1+x-y)=
x-2y+1+1-2x+y-1-x+y= -2x+1
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a) (x-y+1)-(2x+y+1)+(x-y+1)=
=x-y+1-2x-y-1+x-y+1=
=-3y+1
===========================
b) -(x-y+1)+(x+y-1)-(y+2x-1)=
=-x+y-1+x+y-1-y-2x+1=
=-2x+y-1
===========================
c) (y-x-1)-(x-y+1)+(2x+y-1)=
=y-x-1-x+y-1+2x+y-1=
=3y-3=
=3(y-1)
===========================
d) (x-2y+1)+(1-2x+y)-(1+x-y)=
=x-2y+1+1-2x+y-1-x+y=
=-2x+1
a)
(x-y+1)-(2x+y+1)+(x-y+1)=
x-y+1-2x-y-1+x-y+1= -3y+1
b)
-(x-y+1)+(x+y-1)-(y+2x-1)=
-x+y-1+x+y-1-y-2x+1= -2x+y-1
c)
(y-x-1)-(x-y+1)+(2x+y-1)=
y-x-1-x+y-1+2x+y-1= 3y-3
d)
(x-2y+1)+(1-2x+y)-(1+x-y)=
x-2y+1+1-2x+y-1-x+y= -2x+1