1.Podane wyrazenia zapisz w jak najprostszej postaci. a) x-(y-(x-y)-x-(y-x)) b) 1-a-(1-(a-1)-2a-(1-3a))-a-1

a) x-(y-(x-y)-x-(y-x)) = x-(y-x+y-x-y+x) = x-y+x-y+x+y-x = 2x-y b) 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-a