Podane wyrażenia napisz w jak najprostrzej postaci.
1-a-[1-(a-1)-2a-(1-3a)]-a-1=___________________
x-[y-(x-y)-x-(y-x)]=___________________________
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1-a- (1 - a + 1 - 2a - 1 + 3a) - a - 1
1 - a - 1 + a - 1 + 2a + 1 - 3a -a - 1
-2a - 1
x - ( y - x + y - x - y + x )
x - y + x - y + x + y - x
2x - y