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2) (x+y)(a-b)
3) (a do sześcianu + b do sześcianu) - (a do sześcianu - b do sześcianu) = a3 + b3 -(a3 - b3) = a3 + b3 - a3 + b3 = 2*b3
2)(a-b)*(x+y)
3) (a³ + b³) - (a³ - b³) = a³ + b³- a³ + b³ = 2b³