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b) a(b - c) + b(c - a) + c(a - b)=ab-ac+bc-ab+ac-bc= 0
= 6a³-3a²b - ab³ + ab² + b + 3a²b - 6ab
=6a³-ab³+ab²+b-6ab
b) a(b - c) + b(c - a) + c(a - b)=
= ab - bc + bc - ac + ac - bc =
= ab - bc
c) - 4a²b(b - a/2 <ułamek>) + 2ab(2ab - a) =
= -4a²b² + 2a³b + 4a²b² - 2a²b =
= 2a³b - 2a²b