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8xy(4y-x+2x²y²)
b) x²-ax-5(x-a)=
x(x-a)-5(x-a)=
(x-5)(x-a)
2. Doprowadź wyrażenie do najprostszej postaci:
1/9a²b²-1/3ab²=
=1/3ab²(1/3a-b)