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2. Oblicz sprytnie
a) (x-3)(x+3)=
b) (x²-2)(x²+2)=
c) (2b+1)(2b-1)=

3. Rozłóż wyrażenia na czynniki
a) x²-4=
b) -3+9x²=
c) x²-16=
d) x²-2=
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