Podane wyrażenia zapisz w jak najprostszej postaci.
Prosze o pomoc i z mgóry dzięki
a) a-[a-(1-a)]
b) -x-[-(1-x)-(x-1)]
c) x-[y-(x-y)-x-(y-x)]
d) 1-a-[1-(a-1)-2a-(1-3a)]-a-1
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a) a-[a-(1-a)]=a-(a-1+a)=a-(2a-1)=a-2a+1=-a+1
b)-x-[-(1-x)-(x-1)]=-x-(-1+x-x+1)=-x
c) x-[y-(x-y)-x-(y-x)]=x-(y-x+y-x-y+x)=x-(y-x)=x-y+x=2x-y
d)1-a-[1-(a-1)-2a- (1-3a)]-a-1=1-a-(1-a+1)-2a-1+3a-a-1=
=1-a-1+a-1-2a-1+3a-a-1=
=-3
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