Podane wyrażenia zapisz w jak najprostszej postaci :
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-a+1-a=-a+1
b)-x-[-(1-x)-(x-1)]= -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-y+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=-1-2a