Zapisz w jak najprostszej postaci

a) 2x(x – 5) -3(x2 –2x) + (x – 2)x =



b) a(a + b + c) – b(a – b – c) – c(a – b – c) =



c) x(x2 + 2x + 1) – (-4x3 + 8x2 – 6):2 =


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